Answer:
If you don't have a picture of the food web, I'm not sure but it's A or D
_____ are proteins found on the surface of cells.
Histamine
Antibodies
Antigens
Leukocytes
Answer:
Histamine
Explanation:
Histamine works by binding to histamine receptors on the surface of cells.
A(n).........measures and records earthquakes.
it’s a seismograph ! ♡
what are density dependent limiting factors? provide examples and describe how they affect a population.
Answer:
china world was large puplation of ther country and dencity was multiple
Answer:
Density-dependent factors include disease, competition, and predation. Density-dependant factors can have either a positive or a negative correlation to population size. With a positive relationship, these limiting factors increase with the size of the population and limit growth as population size increases.
Erica uses a door knob to open a door. A door knob is an example of a wheel and axle. The knob of the door is the wheel and the shaft is the axle. As Erica turns the knob, the shaft is also turned, and the door opens. The knob of a door always has a larger radius than the shaft so that the distance over which the force is applied _______ in order to _______ the effort force needed to open the door.
A. Decreases, decrease
B. Increases, increase
C. Decreases, increase
D. Increases, decrease
Answer:
D
Explanation:
The knob of a door always has a larger radius than the shaft so that the distance over which the force is applied increases in order to decrease the effort force needed to open the door. Thus, the correct option for this question is D.
What is Force?A force may be defined as an instance of pushing or pulling on an object with mass. This causes an object to change its velocity. It is an external agent capable of changing a body's state of rest or motion. It has a magnitude and a direction, so it is a vector quantity.
According to the context of this question, a door knob is an example of a wheel and axle. The force that is applied on the knob of the door may effectively increase when it is operated by a person. This stimulates a reduction in the effort through which force is needed to open the door.
Therefore, the correct option for this question is D.
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Neurons make up the communication network in your body called ______
Answer:
Nerve Cells
Explanation:
What is the relationship between a cheetah and a deer
Answer:
prey-predator relationship: a cheetah trying to capture a deer so it can eat it.
Explanation:
hope this helps!
-lei
The following diagram represents the reaction of methane with oxygen gas to form carbon dioxide and water.
The chemical reaction shown above takes place in a closed system. What is true about the system while the reaction occurs?
A.
The total number of particles in the system increases.
B.
The total number of particles in the system decreases.
C.
The total mass of the particles in the system stays the same.
D.
The total mass of the particles in the system increases.
no middle schooler awnser my questions
Answer:
C.
The total mass of the particles in the system stays the same. sorry if i am wrong
Explanation:
What is the key to most Al challenges?
Answer
In a general term, AI refers to computational tool that are able to substitute for human intelligence in the performance of certain tasks. This technology is currently advancing at the breakneck pace, much like exponential growth experienced by database technology in the late twentieth century. Databases have grown to become the core infrastructure that drives enterprise-level software over the coming decades is expected to be driven, at least in part, by AI
Explanation:
A sample of water containing somehow and bacteria was kept in a container. After some days it was observed that only snowball existed. What is the reason for the disappearance of the bacteria?
Answer:
LACK OF FOOD AND AIR FOR GASEOUS EXCHANGE
Explanation:
Albinism is a lack of what protein ?
Answer: Tyrosinase
Explanation: It's an enzyme that contains melatonin.
PLEASE HELP 20 POINTS RIGHT ANSWERS ONLY
A scientist is studying three different plant species that appear to be closely related. All three are found in a wide variety of environments and are very similar in appearance. Which of the following would provide the best evidence regarding the evolutionary relationship of these three species?
Comparing the different climates in which the species can be found
Comparing the genomes of each species to see which are most similar
Determining whether the plants are capable of both sexual and asexual reproduction
Determining which types of animals eat each species
Determining the genomes of each species to see which is similar will provide the best evidence regarding the evolutionary relationship of these species. So the correct option is B.
What are evolutionary relationships?The relationships of different species with each other based on their history of evolution are called evolutionary relationships.
The study of the relationships between organisms by categorizing them into various kinds of groups is called systematics.
All the species of organisms, from bacteria to mammals have evolved from some kind of ancestral species by the process of evolution.
Determination of these evolutionary relationships is the key to understanding the process of evolution. Evolutionary relationships are determined by using evolutionary trees which are diagrammatic representations of ancestral species and their descendants.
The study of genomics to identify the similarity between organisms is yet another useful tool to determine the relationship between them.
Therefore the correct option is B.
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3
How did scientists determine Earth has layers?
OA. through the use of earthquake waves
OB.
through deep core drilling
Oc. through x-ray analysis
OD. through the use of magnetometers
Reset
Next
Answer:
The correct answer is - A. through the use of earthquake waves.
Explanation:
The interior of the earth can not be studied or seen by digging the hole, for that scientist normally use the movement of seismic waves, from earthquakes or nuclear test explosions, are reflected, slow down, sped up bent by passing through the different layers.
Waves behave differently as they move in different layers and their material helps scientists to learn and study the layers and their constituents. It explains that the Earth's interior has a series of concentric shells, with a thin outer crust, a mantle, a liquid outer core, and a solid inner core.
body cell wall consisting of two germ layers
Due to its location, Hawaii does not have very many land birds. The Hawaiian honeycreepers are a favorite for many ornithologists. There are over 50 species of honeycreepers that can all be traced back to one ancestor. The level of diversity in an ecosystem can be determined by the frequency of speciation and extinction.
a) Describe speciation and identify two possible prezygotic barriers of the Hawaiian honeycreepers that contribute to speciation.
b) If the Hawaiian honeycreepers became extinct, explain how the newly available niches could lead to speciation.
Answer:
In speciation, organisms evolved with the passage of time.
Explanation:
Speciation is the evolutionary process in which populations of species evolve with the passage of time to become different species from the original one. Temporal isolation and gametic isolation are two possible prezygotic barriers of the Hawaiian honeycreepers that contribute to occur speciation. The newly available niches could lead to speciation of that organisms that tolerate the Hawaiian climatic conditions when the extinction of Hawaiian honeycreepers occurs. The new organisms used the available resources such as food and space etc and increase its population.
Earth’s largest ecosystems are the?
Answer:
The World Ocean
Explanation:
The World Ocean is the largest existing ecosystem on our planet. Covering over 71% of the Earth's surface, it's a source of livelihood for over 3 billion people.
^Hope this helps, Hazel^What TYPE of nucleic acid is found in the Ebolavirus?
Answer:
virion nucleic acid
The virion nucleic acid of Ebola virus consists of a single-stranded RNA with a molecular weight of approximately 4.0 x 10(6).
Explanation:
2) Choose the best answer.
An organelle where amino acids are joined to make proteins is a ___________.
A. cytoskeleton
B. lysosome
C. mitochondria
D. vacuole
E. ribosome
3) Choose the best answer.
The ________ provides structure and support to the cell.
A. vacuole
B. cytoplasm
C. cytoskeleton
D. lysosome
E. mitochondria
4) Choose the best answer.
An organelle which is involved in photosynthesis is the _________.
A. chloroplast
B. vacuole
C. cytoskeleton
D. ribosome
E. lysosome
Explanation:
2) E) ribosome .
3) c) cytoskeleton: The cytoskeleton is a series of fibers made from proteins. It provides structure to the cell and gives it its shape it its shape.
4) a) chloroplast
A segment of dna/chromosome containing the instructions for building a protein which will result in a trait is called a ___
Answer: A segment of dna/chromosome containing the instructions for building a protein which will result in a trait is called a GENE.
Explanation:
CHROMOSOMES are made up of two threads called chromatids joined at a point called the centromere.
In the chemical nature of chromosomes, each is made up of a protein framework which has a long molecule of DNA (deoxyribonucleic acid) coiled round it. A segment of DNA containing the instructions for building a protein which will result in a trait is called a GENE.
The GENES in the cell of a diploid organism contain all the necessary instructions for building up the organism.These instructions are written on a molecular scale.. Most genes contain information to direct the synthesis of specific proteins. Each such protein takes part in the development of a particular character.
A protein is made up of one or more chains of amino acids known as polypeptides. The sequence of bases in a DNA molecule determines the type of amino acid and the sequence in which they are arranged in a polypeptide chain.
A gene therefore is a sequence of triplets of the four bases which specifies the structure of a protein
What is DNA, Example of DNA, Why is DNA important to our life
Answer:
DNA is pivotal to our growth, reproduction, and health. It contains the instructions necessary for your cells to produce proteins that affect many different processes and functions in your body. Because DNA is so important, damage or mutations can sometimes contribute to the development of disease.
Short for deoxyribonucleic acid. The nucleic acid that is the genetic material determining the makeup of all living cells and many viruses. ... An example of DNA is the chain of basic materials in the chromosomes of the human cell.
Explanation:
brainliest?
Which of the following is not a consequence of lack of conservation?
A)
cost of additional wastewater treatment facilities
B)
water contamination from overirigation
C)
availability of land for use
D)
destruction of wildlife habitats
Answer:
C. ) availability of land for use
Explanation:
Not conserving water would not increase the amount of land available for use
A denisty of a bottle weighs 0.25N when empty & 0.75N when filled with water & 0.65N when filled with alcohol. Calculate;. 1) the volume of the bottle 2) the denisty of the alcohol (denisty of water is 1000kg/m & g is 10m
Answer:
[tex]0.05\times 10^{-3}\ \text{m}^3[/tex]
[tex]800\ \text{kg/m}^3[/tex]
Explanation:
[tex]W_b[/tex] = Weight of bottle = 0.25 N
[tex]W_w[/tex] = Weight of water = [tex]0.75-0.25=0.5\ \text{N}[/tex]
g = Acceleration due to gravity = [tex]10\ \text{m/s}^2[/tex]
[tex]\rho_w[/tex] = Density of water = [tex]1000\ \text{kg/m}^3[/tex]
Mass of water
[tex]m_w=\dfrac{W_w}{g}\\\Rightarrow m_w=\dfrac{0.5}{10}\\\Rightarrow m_w=0.05\ \text{kg}[/tex]
Volume is given by
[tex]V_w=\dfrac{m_w}{\rho_w}\\\Rightarrow V_w=\dfrac{0.05}{1000}\\\Rightarrow V_w=0.05\times 10^{-3}\ \text{m}^3[/tex]
Volume of the bottle is [tex]0.05\times 10^{-3}\ \text{m}^3[/tex].
This means that the alcohol will take the same amount of volume.
[tex]W_a[/tex] = Weight of alcohol = [tex]0.65-0.25=0.4\ \text{N}[/tex]
Mass of alcohol
[tex]m_a=\dfrac{0.4}{10}\\\Rightarrow m_a=0.04\ \text{kg}[/tex]
Density is given by
[tex]\rho=\dfrac{m_a}{V_w}\\\Rightarrow \rho=\dfrac{0.04}{0.05\times 10^{-3}}\\\Rightarrow \rho=800\ \text{kg/m}^3[/tex]
Density of alcohol is [tex]800\ \text{kg/m}^3[/tex]
The volume of the bottle is 50 mL and the density of alcohol is 0.8 g/c[tex]m^{3}[/tex]
The weight of empty bottle is 0.25N
the weight of bottle filled with water is 0.75N
therefore, the weight of water in the bottle is 0.75N - 0.25N = 0.50N
we know that weight, w =mg , where m is the mass of substance and g is acceleration due to gravity. Here we will take g= 10 m/[tex]s^{2}[/tex] for simplicity.
⇒ m = w/g = 0.5/10 = 0.05 kg
⇒ mass of water is 50g
now, the density of water ρ(w) = 1g/[tex]cm^{3}[/tex] = 1g/mL
relation between mass, density and volume is:
V = m/ρ = 50/1 = 50mL
Hence the volume of the bottle is 50mL.
Now it is given that the weight of bottle filled with alcohol is 0.65N
⇒ weight of alcohol = 0.40N
⇒ mass of alcohol = 0.40/g = 0.40/10 = 0.040kg = 40g
The volume of the bottle remains the same, so to calculate the density of alcohol we use the above mentioned relation between mass, density, and volume on alcohol.
That is, V = m/ρ
⇒ ρ(al) = m/V = 40/50 g/c[tex]m^{3}[/tex]
ρ(al) = 0.8 g/c[tex]m^{3}[/tex] or 0.8 g/mL
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Which is a compound composed of carbon, hydrogen, and oxygen in a ratio of one oxygen and two hydrogen atoms for each carbon atom?
100 points
I do not get this at all any help would be nice
Assignment
Calorie Counting and Expenditure Exploration
Total Score: ____ of 30 points
Instructions: Use the data table that shows the estimation of the daily resting energy expenditure (REE) to explore how calorie requirements change as a person gets older. Follow the steps to calculate the REE for a person over time. Record your calculations in the table.
Decide to calculate the REE for a male or female.
Choose an adult weight.
Calculate the REE for the adult from age 18-29, 30-60, and over 60. Assume the adult maintains the same body weight at each age.
(Score for Question 1: ___ of 1 point)
Male or female
Answer:
(Score for Question 2: ___ of 1 point)
Weight
Answer:
Table
(Score for Table: ___ of 18 points)
Use the Table of the Estimation of the Daily Resting Energy Expenditure (REE) to determine the calculation used for each age range.
Age Range
Calculation from Table
Resting Caloric Expenditure
18-29
30-60
60+
Questions
(Score for Question 1: ___ of 5 points)
How does the REE change as a person ages?
Answer:
(Score for Question 2: ___ of 5 points)
What do these results indicate about how the body's metabolism changes over time?
Answer:
The way the REE changes how a person ages is through the reduction in fat-free mass.
What is resting energy expenditure?This refers to the metabolism of the body that occurs when the body is at rest, due to homeostasis and biological equilibrium.
Hence, other factors that can lead to the aging process of a person based on this resting energy expenditure (REE) are the decrease in muscle mass, in relation to FFM and also the decrease in tissue metabolic rates.
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Which can be prevented with vaccines: bacteria,
viruses, or both?
Answer:
Both
Explanation:
But not all viruses can be stopped by vaccines as there are retro viruses which are impossible to stop
can someone tell me if this is right plzz
Answer:
Maybe but double check
Explanation:
What is the function of the Turbine in a power plant using fossil fuels?
O A. To recycle the steam back into water.
B. To generate the steam to turn the generator.
OC. To burn the fossil fuels, generating heat.
OD. To spin the generator using steam.
Answer:
D
Explanation:
The function of the Turbine in a power plant using fossil fuels is to spin the generator using steam.
What is a turbine?Turbines are mechanical devices that are used to extract energy from fuel or air. These are the fans that run by the water or air and generate electricity. They are large fans and that move very fast.
Thus, the correct option is D.
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4. Determine the phenotype for each genotype below if purple flowers are 1
dominant to white flowers: PP *
Purple
White
Pink
Answer:
Pw
Explanation:
If double P is dominant then Pw is dominan to white
Describe two ways in which RNA differs from DNA.
Answer:
RNA contains the sugar ribose, while DNA contains sugar deoxyribose type of ribose that lacks one oxygen atom) RNA has the nucleobase uracil while DNA contains thymine.
Explanation:
RNA- Sugar ribose, nucleobase uracil
DNA - Sugar deoxyribose, thymine
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Which of these statements is true of ecosystems? a animals do not travel from one ecosystem to another ecosystem b the total amount of energy in an ecosystem does not change c air cannot be used by organisms once the air moves out of the ecosystems d matter lost by one ecosystem is gained by the surrounding environment
Answer:
I think the answer is B. I think energy decreases as it moves up tropic levels when it is lost as the organisms from one level consume the organisms in the other.
Explanation:
It can't be A because animals do travel from one ecosystem to another. It's migration. It's not C because air can be used by organisms as once as the air moves out of their ecosystem because air is everywhere and the organisms need air to breathe and to live. D is definitely incorrect because matter can't be created or destroyed. Remember that an ecosystem is the organisms physical environment. I hope this answers your question.
D, matter lost by one ecosystem is gained by the surrounding environment
Explanation: Here's an explanation for why D is right and all the other ones are wrong.
D- when matter is lost from one ecosystem, it is often gained by another nearby ecosystem. For example, when leaves fall from trees in a forest, they decompose and release nutrients into the soil. These nutrients can then be taken up by plants in the same ecosystem or be transported by water runoff to other ecosystems, such as rivers or lakes. This process of matter transfer ensures the cycling of nutrients within and between ecosystems.
A- animals can and do travel from one ecosystem to another. Birds migrate between different habitats, and some animals spread seeds or pollinate flowers in multiple ecosystems. B- the total amount of energy in an ecosystem does change over time. Energy enters an ecosystem through photosynthesis, where plants convert sunlight into chemical energy. This energy is then passed on to other organisms through the food chain. However, energy is lost as heat during these transfers and eventually leaves the ecosystem, resulting in a decrease in the total amount of energy available. C- organisms rely on air for respiration, and the exchange of gases, like oxygen and carbon dioxide, occue between organisms and the air in the environment. While air moves in and out of ecosystems, organisms continuously utilize the air for their survival.
help please!!!!! i need help!!