They say humans lost their hair to ward off ectoparasites that live in their fur.
Strong evidence supports that the human lineage diverged from the lineage that gave rise to the great apes in Africa 6-7 million years ago. Evidence of tool-making dates back to about 3.3 million years ago in Kenya.
Prehistory is the period that began with the appearance of humans about 5 million years ago and ended with the invention of writing about 6,000 years ago. It is a long period of time divided into three phases Paleolithic-Neolithic and Metallic. Indeed, after the last common ancestor with chimpanzees and before the origin of Homo sapiens.
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Select the option from the following which is not a major characteristic features of biodiversity hotspots Large number of speciesDestruction of habitatsAbundance of endemic speciesLarge number of exotic species
Select the statement that best explains why the replication machinery is found at the replication fork. Multiple Choice The replication machinery can move fastest orid most efficiently along the DNA template at the replication fork. The replication machinery must be able to open and stabilize the template DNA and it must have access to both template strands for replication The replication fork is a specific sequence of DNA to which the replication machinery is permanently bound The replication machinery can move fastest and most efficiently along the DNA template at the replication fork The replication machinery must be able to open and stabilize the template DNA, and it must have access to both template strands for replication The replication fork is a specific sequence of DNA to which the replication machinery is permanently bound The replication fork is the region of DNA that is capable of initially being nicked and opened up by the replication machinery so the replication machinery stays at this spot in order to replicate the DNA
The replication machinery must be able to open and stabilize the template DNA and it must have access to both template strands for replication. Option B.
Replication is very rapid because multiple polymerases can synthesize two new strands simultaneously, using each unwound strand of the original DNA duplex as a template. Replication is initiated by a virus-encoded protein that binds to the origin and also functions as a helicase.
A single-stranded DNA binding protein is required to stabilize the unwound template and the DNA polymerase-α-primase complex initiates DNA synthesis. The replication machinery, the replisome complex consists of a number of specialized proteins that function to support replication by DNA polymerases.
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Which correctly identifies how natural selection causes a change in species over time?
a. People choose mating pairs based on desirable characteristics.
b. The environment favors those individuals with the best phenotypes for survival.
c. If an anatomical feature is not used for several generations, offspring will cease to inherit that trait.
d. There is a trend towards homozygous dominant genotypes becoming the most common in the population.
Answer:
B. The environment favors those individuals with the best phenotypes for survival
Explanation:
Answer:
B
Explanation:
Natural selection is the process by which certain traits become more or less common in a population over time. It occurs when individuals with certain traits are more likely to survive and reproduce than those without those traits, and as a result, the traits become more common in the population.
This process is driven by the environment, which "favors" individuals with the best phenotypes (physical characteristics) for survival. For example, if an environment is cold and snowy, individuals with thick fur will be more likely to survive and reproduce than those with thin fur, so the trait for thick fur will become more common in the population over time.
Option a, "People choose mating pairs based on desirable characteristics," is incorrect because natural selection is a process that occurs in nature, not as a result of human intervention. Option c, "If an anatomical feature is not used for several generations, offspring will cease to inherit that trait," is incorrect because traits are not lost due to disuse. Option d, "There is a trend towards homozygous dominant genotypes becoming the most common in the population," is incorrect because natural selection does not favor any particular genotype (the genetic makeup of an individual) over others.
binding of a ligand to cell surface receptor what would interfere with the actions of epinephrine through a g-protein coupled receptor?
The G protein switches GDP for GTP when the GPCR is activated. now-active G protein splits into two pieces, which are released from the GPCR.
Cell surface receptors belonging to the large family of G protein-coupled receptors (GPCRs) that share a similar structure and signaling mechanism. A class of protein known as a G protein is used by members of the GPCR family to transmit signals inside cells. Each member of the GPCR family has seven distinct protein segments that cross the membrane. The G protein eventually loses its activity when the subunit hydrolyzes GTP back to GDP. A three-piece unit of the dormant G protein that is connected to a GPCR is formed once more.
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what effect might the bicylic ring system of cephalosporin have on their chemical and biological properties
Cephalosporins are a group of broad-spectrum semisynthetic beta-lactam antibiotics. Cephalosporins kill bacteria by inhibiting the synthesis of peptidoglycan.
Cephalosporins are fungicides that directly kill bacteria. They do this by interfering with the bacterial cell wall structure. Cephalosporins are divided into five generations based on when they were developed. Each generation is generally effective against a specific type of bacteria.
Cephalosporins have low toxicity and are generally safe. The most common side effects of cephalosporins are nausea, vomiting, loss of appetite, and abdominal pain. Cephalosporins and other β-lactam antibiotics cause proximal tubular necrosis in humans and experimental animals. Selective toxicity for PCT occurs due to high intracellular concentrations achieved by active transport by organic anion transporters.
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Cephalosporins have low toxicity and are generally safe. The most common side effects of cephalosporins are nausea, vomiting, loss of appetite, and abdominal pain.
Cephalosporins are fungicides that directly kill bacteria. They do this by interfering with the bacterial cell wall structure. Cephalosporins are divided into five generations based on when they were developed. Each generation is generally effective against a specific type of bacteria.
Cephalosporins and other β-lactam antibiotics cause proximal tubular necrosis in humans and experimental animals. Selective toxicity for PCT occurs due to high intracellular concentrations achieved by active transport by organic anion transporters.
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human use of pesticides to control insect pests introduces toxic chemicals into the food chain as organisms absorb the pesticides at a rate greater than that at which the chemical is lost. which term describes this situation?
Because organisms absorb pesticides at a rate greater than that at which the chemical is lost, human use of pesticides to control insect pests introduces toxic chemicals into the food chain. The term pesticide pollution can be used to describe this situation
Soil, water, turf, and other vegetation can be tainted by pesticides. Pesticides can be harmful to a wide range of other organisms, including fish, beneficial insects, non-target plants, and insects and weeds. Pesticide drift occurs when pesticide particles that are suspended in the air are carried by the wind to other locations and may contaminate them.
Pesticides can significantly reduce, alter the behavior of, or eradicate populations of plants and animals, in addition to their direct toxicity. A trophic cascade, also known as a cascade up and down food chains, can result from these effects. One easily understood example of ecosystem-mediated pesticide effects is a trophic cascade.
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Place each label in the proper position to designate the appropriate glial cell.
1. Oligodendrocytes
2. Ependymal Cells
3. Microglia
4. Astrocytes
5. Schwann Cells
6. Satellite Cells
1. surround and insulate cells of the PNS and found around the somas
2. produce and circulate CSF
3. multi-functioning cell involved with neurogenesis, scar formation, etc.
4. form the myelin sheath in the CNS
5. insulate neurons and enhance the rate of transmission in the PNS
6. most abundant CNS glial cells
7. macrophages of the CNS
8. form the myelin sheath in the PNS
9. ciliated cells resembling epithelium
Answer:
Oligodendrocytes : 4. form the myelin sheath in the CNSEpendymal Cells : 9. ciliated cells resembling epithelium, 2. produce and circulate CSFMicroglia : 7. macrophages of the CNSAstrocytes : 6. most abundant CNS glial cells, 3. multi-functioning cell involved with neurogenesis, scar formation, etc.Schwann Cells : 8. form the myelin sheath in the PNS, 5. insulate neurons and enhance the rate of transmission in the PNSSatellite Cells : 1. surround and insulate cells of the PNS and found around the somas17. Orangutans get most of the energy they need from fruit. Energy must go through several steps before it
can be used by the cells in the orangutan's body. Number the steps to show the path energy follows from
the sun to the orangutan's cells.
Answer:
Energy from the sun is absorbed by plants through photosynthesis.The plants convert the energy from the sun into chemical energy through the process of photosynthesis.The orangutan eats the fruit, which contains the chemical energy stored by the plants.The orangutan's digestive system breaks down the fruit and releases the chemical energy stored in the fruit's molecules.The chemical energy is converted into ATP (adenosine triphosphate), a molecule that cells can use for energy.The ATP is transported to the cells in the orangutan's body.The cells use the ATP to carry out their functions, releasing energy in the process.Some plants (ex. Venus fly trap, pitcher plants) can capture insects for an easy "meal". The biggest benefit is the_________
(an element) they gain from the insect because their soils lack that element.
Some plants (ex. Venus fly trap, pitcher plants) can capture insects for an easy "meal". The biggest benefit is the fulfill their nutrient requirement.
Why do plants capture insects?Insectivorous plants capture insects because they grow on shallow soil that is low in nutrients, therefore they devour insects to meet their nutritional needs.
These plants have developed the capacity to capture and consume insects, which are a great source of nitrogen as they have a mass nitrogen content of 10% . Depending on the habitat and the sort of trap used, carnivorous plants can get anywhere from 10% to 80% of their total nitrogen from insects.
Some plants (ex. Venus fly trap, pitcher plants) can capture insects for an easy "meal". The biggest benefit is the fulfill their nutrient requirement.
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nitric oxide is unusual among animal signal molecules in that it __________.
Nitric oxide is unusual among animal signal molecules in that it is a gas. Correct answer: letter D.
Because it is highly reactive and diffuses rapidly throughout cells, tissues, and organs. It is also highly soluble in lipids, making it able to quickly penetrate cell membranes and interact with proteins and enzymes on the other side. This makes it ideal for rapid, long-range signaling.
What is nitric oxide?Is a colorless and odorless gas produced by the body. It plays an important role in the body, acting as a signal molecule in the cardiovascular and nervous systems, and also acting as an important factor in the body's defense against infection.
It has been used medically to treat a variety of conditions, including:
High blood pressure.AnginaErectile dysfunction.Nitric oxide is unusual among animal signal molecules in that it __________.
Group of options:
A) Enters the cell via a protein channel
B) Acts by directly binding to DNA
C) Binds to membrane receptors and cytoplasm receptors
D) Is a gas
E) Activates proteins by removing phosphate
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superantigen type toxins lead to the release of excessive amounts of __________________ stimulating a hyperactive immune response that can lead to shock and death in the affected individual.
Superantigen type toxins lead to the release of excessive amounts of cytokines stimulating a hyperactive immune response that can lead to shock and death in the affected individual.
In the field of biology, cytokines can be described as such type of cells that are majorly involved in the production of immune cells.
In the case of superantigens, more production of antibodies are required as an immune response. Hence, as a result of superantigens invading the body, more cytokines will be produced for generating a greater, hyperactive immune response. As a result of higher degrees of cytokine production, the brain can lead to shock and death in the affected individual.
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a person is experiencing low blood pressure. they have a decrease in rbcs which has caused anemia and as a result they feel lightheaded and fatigued. they urinate frequently, releasing greater quantities of urine than normal. they are also beginning to experience muscle cramps and twitches due to toxins affecting their nervous system. they most likely have a problem with which organ?
A person experiencing low blood pressure, anemia, lightheadedness, fatigue, frequent urination, muscle cramps, and twitches most likely has a problem with their kidneys.
The kidneys are essential organs for maintaining health and regulating bodily functions. They filter waste products from the blood and release them from the body in the form of urine. When the kidneys are not functioning properly, toxins and other waste products can build up in the body, leading to a host of symptoms. Low blood pressure, anemia, lightheadedness, fatigue, frequent urination, muscle cramps, and twitches are all common symptoms of kidney dysfunction.
The kidneys also play an important role in regulating red blood cell production. If there is a decrease in red blood cell production, as in the case of this person, it is likely a result of impaired kidney function. Anemia can cause a range of symptoms, including lightheadedness, fatigue, and muscle cramps.
In conclusion, a person experiencing low blood pressure, anemia, lightheadedness, fatigue, frequent urination, muscle cramps, and twitches is likely experiencing kidney dysfunction. This can cause a range of symptoms, including those mentioned, and should be addressed with the help of a medical professional.
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This diagram shows the process of translation. Which statement is true?
DNA contains the codon for the tRNA to link
the amino acid chain is brought in at the beginning of the process
the tRNA codon attaches to the mRNA anticodon
mRNA contains the codon
Answer:
mRNA contains the codon
Explanation:
amino acids chain/ polypeptide is brought in at the end of the process. tRNA anticodon attaches to the mRNA anticodon.
according to bioecological systems theory of development, the child is most directly affected by:
According to the developmental theory of bioecological systems, children are most directly affected by microsystems.
Bioecological systems are based on the idea that children's relationships with their parents and caregivers affect their development, and those relationships are influenced by the environment of work, school, and community, and are based on the idea that is influenced by broader social, cultural, and insurance influences. conditions.
A microsystem is an environment with specific physical characteristics, resources, activity patterns, roles, and interpersonal relationships experienced by a developing person. A key feature of this definition is the word experience.
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neuron. parts and functions of each one. which part is the receiving area of the stimulus and which transmit the impulse?
Dendrites are the receiving area of the stimulus and axons transmit the impulse.
Neurons are specialized cells, located in the nervous system, which convey information. Axons, soma, and dendrite are all parts of a neuron. The myelin sheath, a fatty covering that surrounds some axons and serves as an insulator to speed up electrical signal transmission, is present on some axons. The dendrite is a branch-like extension that connects to the soma and delivers electrical stimulation. It also receives information from other neurons. Information is sent from the soma to the terminal buttons via an extended fiber called an axon. Neurotransmitters use a lock-and-key mechanism to chemically convey information from the terminal buttons, through the synapses, to the receptive dendrites. Together, the numerous neurotransmitters have an impact on cognition, memory, and behavior. Drugs are called antagonists to impede the functions of neurotransmitters, whereas agonists imitate those of neurotransmitters.
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GIVING LOTS OF POINT AND BRAINLIEST TO CORRECT ANSWER!!!!!
A population of birds has some red birds and some brown birds. This difference in color from one bird to another is called a(n)
[ Select ]
. The red birds are eaten more often by predators because they are easier to see, but the brown birds blend in with their environment and are not eaten as often. The brown color in these birds is called a(n)
[ Select ]
. 100 years ago, most of the birds in the population were red. After many generations have died and reproduced, today, most of the birds in the population are brown. This process is called
[ Select ]
Answer:
variation, adaptation, natural selection
A population of birds has some red birds and some brown birds. This is a variation in the color of birds. This variation in the color from one bird to another is called evolution.
What is a Population?A population is a group of individuals which belong to the same species which is living in a particular area at a definite time period.
The red birds in the bird population are eaten up more often by the predators because they are more easily identified, these birds are visible however the brown birds blend in with their environment so easily and thus are not eaten as often like that of red birds. The brown color in these birds shows cryptic coloration.
100 year ago, most of the birds in the population were red. After many generations have died and reproduced, today, most of the birds in the population are brown. This process is called as natural selection. This is the evolution of bird population.
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explain how the structure of a chloroplast (its membranes and thylakoids) makes its function (the chemical reactions of photosynthesis) more efficient.
Answer:
These internal membranes stack on top of each other, just like a stack of pancakes.
The structure of a chloroplast, specifically its membranes and thylakoids, makes its function, the chemical reactions of photosynthesis, more efficient because it provides a large surface area for the reactions to occur on and a way to organize the reactions in a sequence that allows the products of one reaction to be used immediately in the next reaction.
The membranes of a chloroplast are made up of two layers of phospholipid molecules, which form a lipid bilayer. This structure provides a large surface area for the chemical reactions of photosynthesis to occur on. The thylakoids, which are stacks of membrane-bound compartments, increase the surface area even further.
In addition, the structure of the thylakoids allows the reactions of photosynthesis to be organized in a sequence that allows the products of one reaction to be used immediately in the next reaction. The thylakoids are arranged in stacks called grana, which are interconnected by strands of thylakoid membrane called stroma lamellae. The thylakoid membranes within a granum are organized into discrete units called photosystems, which are the sites of the light-dependent reactions of photosynthesis. The thylakoid membranes within the stroma lamellae are the site of the light-independent reactions of photosynthesis. This organization allows the products of the light-dependent reactions, which are carried out in the thylakoid membranes of the grana, to be used immediately in the light-independent reactions, which take place in the thylakoid membranes of the stroma lamellae.
Overall, the structure of a chloroplast, with its membranes and thylakoids, provides a large surface area for the reactions of photosynthesis to occur on and a way to organize the reactions in a sequence that allows the products of one reaction to be used immediately in the next reaction. This makes the function of the chloroplast, photosynthesis, more efficient.
What releases hormones that increase the rate of cellular respiration throughout the body
Thyroxine and progesterone have long been known to increase breathing. More recently, it has been proposed that a number of hormones, including leptin and corticotropin-releasing hormone, can stimulate breathing.
Dopamine, neuropeptide Y, and somatostatin all inhibit respiration.
The process of converting biochemical energy from foods into adenosine triphosphate (ATP) and then releasing waste products is known as cellular respiration. Cellular respiration is a collection of metabolic events and activities that occur in the cells of animals. The citric acid cycle happens in the mitochondrial matrix, oxidative phosphorylation happens on the inner mitochondrial membrane, and glycolysis happens in the cytoplasm. Glucose, ATP, and NAD+ are the initial reactants and ATP and H 2 O are the end products of cellular respiration.
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FILL IN THE BLANK. Converting a prairie to a farm field is an example of ________. a. overharvesting, b. habitat loss, c. exotic species, d. climate change.
Converting a prairie to a farm field is an example of habitat loss. Correct answer: letter B.
Because the prairie is no longer providing a habitat for the animals and plants that naturally occur in the area.
Importance of grassland conversionThe conversion of the prairie to a farm field has removed the natural habitat and replaced it with an agricultural system that is not suitable for the original inhabitants. This type of habitat destruction can have serious consequences for the environment, as it can lead to a decrease in:
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a group of freshwater green algae known as charophytes are the most closely related ....... to plants.
A group of freshwater green algae known as charophytes are the most closely related to land plants.
Green algae come in a wide variety, including single-celled and multicellular species that have sexual and asexual reproduction abilities. Due to their many structural and metabolic similarities to plants, green algae are difficult to classify.
Charophytes are a group of green algae that are closely linked to embryophytes, while chlorophytes are a group of other green algae.
Charophytes contain cellulose-based cell walls, store carbohydrates as starch, have chlorophyll a and b, and go through similar cell-division processes like plants. The reproductive organs of charophytes are distinctive and very different from those of other algae.
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a forensic science technician works in the biotechnology research and development pathway. t or f
A forensic science technician works in the biotechnology research and development pathway. This statement is true.
Who is a technician in forensic science?
Criminalists or crime scene investigators are generalist forensic science technicians that gather evidence at the scene of a crime and conduct scientific and technical examination in labs or offices. collecting proof. examining the evidence. interacting with law enforcement and providing testimony in court. Technicians in forensic science produce reports and give testimony in court. They collaborate with specialists and other law enforcement officers frequently. Ability to think critically. When comparing physical evidence to suspects, such as fingerprints and DNA, forensic science technicians utilise their best judgement.
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A forensic science technician works in the biotechnology research and development pathway. This statement is true.
Who is a technician in forensic science?Criminalists or crime scene investigators are generalist forensic science technicians that gather evidence at the scene of a crime and conduct scientific and technical examination in labs or offices. collecting proof. examining the evidence. interacting with law enforcement and providing testimony in court. Technicians in forensic science produce reports and give testimony in court. They collaborate with specialists and other law enforcement officers frequently. Ability to think critically. When comparing physical evidence to suspects, such as fingerprints and DNA, forensic science technicians utilise their best judgement.
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the first draft of the human genome project was published in 2003. what techniques did they use? g
The techniques used in the first draft of the Human Genome Project published in 2003 was gene mapping and DNA Sequencing.
In the most basic terms gene mapping is the process of determining the location of the jeans on the threads of the chromosome present in the nucleus.
DNA Sequencing is a technique that is used to find out the exact number and the sequence of the nucleotides sugar basis in a DNA molecule.
In the first Human Genome Project draft published in 2003, it used the technique of DNA Sequencing and gene mapping to find the DNA pattern and the nature of the human genome.
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Factors contributing to the rise in world hunger include all of the following except?
a. Unequal distribution of available food supplies
b. Loss of or decline in arable land
c. increasing rate of population growth
d. Increasing poverty in developing countries
e. Increasing consumption of vegetable protein in place of meat protein
The factors contributing to the rise in world hunger include all of the following except increasing consumption of proteins.
Millions of families around the world struggle to access nourishing food due to interconnected problems with poverty, inequality, conflict, climate change, gender discrimination, and poor governmental and health systems. Children's bodies and brains suffer when they are undernourished. They are prevented from developing, learning, and working to the fullest extent possible. Children that suffer from extreme hunger may pass away if not treated.
According to the UN Hunger Report, the term "hunger" is used to describe times when people are severely food insecure. This occurs when a person is unable to ensure a consistent, daily source of food that is both safe and nourishing for living an active and healthy life.
Hence, hunger raised due to cumulative effect.
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QUESTION 2
What three properties of water underpin all its effects on Earth's systems?
Answer:
The three fundamental properties of water that underlie its effects on Earth's systems are its liquidity, its high specific heat capacity, and its ability to dissolve many substances.
during the investigation, both brothers had elevated levels of the enzymes carnitine acyltransferase (palmitoyltransferase) i and ii. why might the brothers have elevated levels of these enzymes?
A majority of their energy comes from amino acids.
One of the most important indicators of health is energy. Low energy is frequently cited as a health concern when people are questioned. Similar to this, when asked to name a benefit from a nutritional supplement, people frequently start by mentioning "increased energy."
However, many people are unaware of the connection between energy and amino acids.
Even those of us who are the most spirited want to be more spirited. Therefore, the rise in popularity of energy drinks is not a coincidence. Energy is a relatively nebulous idea, though. We must first distinguish between physical and mental energy in order to comprehend the connection between energy and amino acids.
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The terrain of most of Southern Europe can be described as
flat
lowland
mountainous
agricultural
Which will change most as the system moves toward equilibrium?
O the volume of the solution
O the shape of dye molecules
O the temperature of the water
O the concentration of dye molecules
Answer:
The concentration of the dye molecules.
Explanation:
In time 1, the concentration is to the left. However, at equilibrium, or time 3, the concentration in equal in both sides. So that means it changed.
The temperature, volume or shape cannot change.
the most latent heat would be released in a ____ parcel of ____ saturated air.
The most latent heat would be released in a Rising parcel of Warm saturated air.
What is Latent Heat?Latent heat is the heat or energy that is either absorbed or released when a substance undergoes a phase change. It could change from a solid to a liquid, a liquid to a gas, or the opposite. Latent heat is related to enthalpy, a property of heat. However, when talking about latent heat, it's important to remember that the substance's temperature remains constant. Latent heat is the work required to overcome the attractive forces holding molecules and atoms together in a substance, according to the mechanism.
Latent Heat Transfer TypesLatent Heat of Fusion: The heat that is used or lost as matter melts and transitions from a solid to a fluid structure at a constant temperature is known as the latent heat of fusion.
Latent Heat of Vaporization: The heat used or lost during the transition of matter from a fluid to a gas at a constant temperature is known as the latent heat of vaporisation.
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which of these cell components are most involved in determining the basic shape of each girl’s face?
a. Cytoplasm, chloroplasts, and genes
b. Vacuoles, nucleus, and chromosomes
c. Genes, chromosomes, and nucleus
d. Chromosomes, chloroplasts, and vacuoles
FILL IN THE BLANK. in queensland, australia, cactus moths (cactoblastis cactorum) ________.
Semi touchy pear cactus was effectively eradicated from rangeland by cactus moths.
Cactoblastis cactorum, a South American native, was introduced from Argentina to Australia throughout 1925 to control several Opuntia species from North and South America. Later, for the same reason, the cactus moth has been introduced into Hawaii, India, South Africa, as well as a few Caribbean islands.
Cactoblastis cactorus has indeed been introduced to Florida several times. According to genetic analyses, established populations were most likely established from introduced Caribbean moth populations.
Adults have wingspans ranging from 22 to 35 mm. The forewings seem to be grayish-brown in colour, becoming whiter near the costal margin. There are distinct black antemedial but also subterminal lines. Hindwings were indeed white with some grey at the tips. Adults of a subfamily physician frequently appear extremely similar to each other and are difficult to identify because specimen scales are frequently rubbed off; even so, genitalia could provide positive identification.
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