A sample of moon rock was brought back from the latest moon mission. Scientists are eager to date this rock to see when it was formed. They will use a technique called radiometric dating. Their data is shown below. Help the scientists calculate and draw conclusions about each sample.
Potassium-40 decays into Argon-40, known as K-Ar dating. Potassium-40 has a half-life of 1.25 billion years.
Identify the number of half-lives passed after 2.5 billion years.
Explain how you came to this conclusion.
The number of half-lives passed after 2.5 billion years will be 3 half-lives.
We are aware that the challenge of attempting to date a substance is one that scientists encounter frequently. This is due to the fact that we frequently need to know the precise time period to which an item may be legitimately attributed. This has assisted us in determining the age of a great deal of the stuff we have in the modern world.
Half-life is the amount of time it takes for a sample to contain just half of the radioactive material that was originally there. We have been informed that K-Ar dating, or the decay of potassium-40 into argon-40, occurs. Potassium-40 has a 1.25 billion-year half-life. Finding the number of half-lives that have passed after 3.75 billion years is the current challenge at hand.
The number of half-lives can now be stated to be:
3.75 ×[tex]10^{6}[/tex] years/ 1.25 ×[tex]10^{6}[/tex] years
= 3 half-lives
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What is the rate of rainforest deforestation?
Answer:
Deforestation of the Amazon rainforest in Brazil has hit a six-year high, the national space agency, Inpe, reports.
Some 3,988 square kilometres (1,540 square miles) of land were cleared in the region between January and June.
Last year, 3,088 square kilometres of the rainforest were destroyed during the same period.
The Amazon plays an essential role in the planet's oxygen and carbon dioxide cycles, absorbing vast amounts of greenhouse gases from the atmosphere.
Environmentalists blame the increasing levels of deforestation on Brazil's right-wing president, Jair Bolsonaro, who has rolled back environmental protections.
Brazil's environment ministry said it had been forceful in fighting environmental crimes, although in a statement it failed to mention the spike in deforestation.
Hello can someone please help me.
The conservation of genes that encode specific morphological characteristics between different species gives an evidence that supports understanding of evolution.
What is conservation of genes and how it supports evolution?Conservation of genes is the phenomena in which genes are conserved for understanding the process of evolution better.Gene is the smallest unit of genetic information encoded in a human body.Each gene encode specific morphological characters between different species. Different genes encoding different morphological characters are responsible for different functions.To know more about gene visit:
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What’s the correct answer answer asap for brainlist
Answer:
A
Explanation:
Since the main source of phosphorus is found in rocks, the first step of the phosphorus cycle involves the extraction of phosphorus from the rocks by weathering.
A student observes a cell under a microscope. She thinks it might be an animal cell. What is the best question she could ask to distinguish the observed cell from the other cell types?A. Does it have a cell wall?B. Does it have a vacuole?C. Does it have a nucleus?D. Does it have chloroplasts?
The student would certainly observe all of those features. However having a nucleus would only say if it is an eukaryotic or a prokaryotic cell. Big vacuoles and chloroplasts are characteristics of plant cells, so the absence of them could help understand if it really is an animal cell. However, the easiest way to see in a microscope if it is not a plant cell, is to detect if there is a cell wall present. Cell walls are easier to observe as they are structures that surround the plasma membrane, and this is easier to detect by seing the cell under a microscope than organelles inside the cell that would have to be differentiated from other organelles (like vacuoles or chloroplasts).
Therefore, the correct answer is A. Does it have a cell wall?
What advantage does each of the following evolutionary advances give a plant?
Vascular tissue
Xylem:
Phloem:
The evolutionary advances of the Vascular tissue, Xylem, and Phloem of a plant.
Vascular tissues:- due to their vascular tissues, stems maintain even tall plants provided with water so they don't dry out in the air. Vascular flora evolved leaves to accumulate sunlight. at the start, leaves have been tiny and needle-like, which helped lessen water loss.
The vascular tissues of plant life, which can be composed of specialized undertaking tissues, xylem, and phloem, form non-stop systems thru the plant frame and offer delivery pathways for water, vitamins, and signaling molecules and guide a plant body against mechanical stresses.
Xylem:- transports and stores water and water-soluble vitamins in vascular plants. Phloem is accountable for transporting sugars, proteins, and different organic molecules in vegetation. Vascular vegetation is capable of growing higher than other plants because of the rigidity of xylem cells, which assist the plant.
The phloem:- transports sucrose and amino acids up and down the plant. that is known as translocation. In trendy, this happens between where these materials are made and where they're used or saved (the sinks.
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Which of the following correctly compares the sulfur isotopes 32s and 35s
The sentence that correctly compares the sulfur isotopes 32S and 35S is
32S has 16 neutrons, whereas 35S has 19 neutrons.
What are isotopes?Isotopes are two or more atom types that have a differing number of neutrons in their nuclei despite having the same atomic number (number of protons in their nuclei), placement in the periodic table, and chemical element. Although the chemical properties of each isotope of a given element are nearly identical, they differ in their atomic weights and physical characteristics.
The word "isotope" is derived from the Greek words isos, which means "equal," and topos, which means "place," which means "the same location." The name refers to the fact that various isotopes of the same element occupy the same spot on the periodic table.
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What do you notice about the number of energy levels or shells as you move down a group or column in the
periodic table?
nucleoli are present during _____.
Nucleoli are present during interphase. The interphase stage is where cells spend the majority of their time. The nuclear envelope envelops the nucleus at this time.
What are nucleoli?The nucleolus is a spherical component of the cell's nucleus whose main job is to assemble and generate ribosomes. Additionally, ribosomal RNA genes are translated into the nucleolus.
The nucleolus is typically only visible in cells that are in the interphase. The nucleolus is seen to shrink as the cell approaches mitosis along with the condensation of chromosomes, and it eventually vanishes as RNA production ceases. The nucleus may contain one or more nucleoli, which are black, compacted areas.
Therefore, the interphase is the stage in which nucleoli are present.
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4. Background information searches are important to: (check all that apply)
Determine if our question has already been answered
Determine if there are obstacles to studying a topic
Identify various ways to effectively study the topic and assist with designing methodology
Identify gaps, disagreements, and/or inconsistencies in current knowledge
Answer:
neither they nor my father lost anything into tag questions
If mitosis stopped in your body, what effects would you see most rapidly? Which tissues would
be affected later? Which cells would never be directly affected?
Answer: If mitosis stopped in your body, then you would start to have a heart attack, and every cell in your body would cease to duplicate itself therefore, you might suffer severe consequences especially because the heart would have to beat itself, and so forth. Your brain would not be directly affected or your bones, however your blood cells would be affected.
Cell division during mitosis is necessary for replacing damaged or dying cells, as well as repairing damaged or worn-out cells that occur naturally. The main mechanism behind growth is this kind of cell division.
What are the consequences if mitosis stopped in the body?Without mitosis, there wouldn't be any cell division or growth. The fact that genetic information cannot be passed on is most essential. All cell processes would be significantly impacted.
You might also suffer serious consequences, as your heart would have to beat by itself, among other things. Your bones or your brain wouldn't be immediately impacted, but your blood cells would.
Therefore, Every cell in your body would stop replicating itself if mitosis halted, which would induce a heart attack.
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What is the number one way described in the film for an individual to lower their environmental impact?
transportation accounts for 27% of all carbon emissions.
industry is responsible for the majority of greenhouse gas emissions. The primary contributor to transportation-related greenhouse gas emissions is the burning of fossil fuels for our cars, trucks, ships, trains, and airplanes.
You can use the following approach to lessen your transportation's carbon footprint.
Walking and bicyclingTake the public transitCarpoolBefore you drive, considerGet the perfect vehicleTake part in a car-sharing scheme.Limit idle timeFill up your tires.To know more about carbon footprint visit:
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HURRY PLS
Which of the following “Best Management Practices” is NOT a widely used sustainable farming practice?
A. crop rotation
B. precision agriculture
C. efficient irrigation
D. minimal fertilizer use
Answer:
the answer is D. minimal fertilizer use
14. The scientist(s) responsible for building the first model of the DNA double helixwasA. Watson and Crick.B. Rosalind and Franklin.C. Gregor Mendel.
Who are they (people in the options)?
• Watson and Crick, = Two scientists that discovered that the DNA is double-stranded and has a unique structure.
,• Rosalind Franklin, = She used x-ray crystallography to produce an image of DNA.
,• Gregor Mendel ,= He is an Austrian monk that experimented on garden peas and formulated the now known "Mendelian Genetics".
ANSWER: A. = Rosalind Franklin despite producing a photo of DNA through x-ray crystallography failed to make a model for the DNA. Watson and Crick made the model out of Rosalind Franklin's images.
What level of "virulence" is best for the rhinovirus?
2A (2Apro) and 3C (3Cpro) are the level of "virulence" is best for the rhinovirus.
What is Rhinovirus?
The rhinovirus (RV) variety is profoundly assorted, comprising of three species and more than 167 subtypes, using three distinct receptors for cell passage. This variety has been a snag to the advancement of compelling cross-receptive antiviral medicines or immunization systems. Gathering research recommends a potential relationship of infection species/subtypes with disease seriousness introducing the opportunities for antiviral methodologies focusing on unambiguous subtypes rather than all RVs.
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Which of the following is not an example of quantitative data? a. The high temperature for each day in May b. The names of chemicals found in one brand of diet soda c. The win-loss record of a tennis team since 1990 d. The average growth in height of all sophomores over a year
Answer: B: the names of chemicals found in one brand of diet soda. Quantitative means that a number should be involved in the data. All of the other options involve a number of some sort, but names do not fall into that category. Therefore, that is the answer.
What is the density of a mineral which has a mass of 100 grams and a volume of 25 cm3?
a
0.25 g/cm3
b
2.5 g/cm3
c
4.0 g/cm3
d
2,500 g/cm3
C.
Density is mass divided by volume.
See details:
[tex]D=\frac{m}{v}=\frac{100}{25}=4.0[/tex]
Nearly all of the energy that earth receives from the sun is used in photosynthesis. True or False
TRUE or FALSE: Systole and diastole are based on the contraction
state of the atria.
Systole and diastole are based on the contraction state of the atria is referred to as a true statement.
What is Atria?
This is referred to as the two upper chambers which are present in the heart and their role is to receive blood from the veins which is then sent to the ventricles.
Systole and diastole are the terms in the circulatory system which are used to denote period of relaxation of the heart muscle such that diastole means ventricular filling while systole represents ventricular ejection which is therefore the reason why true was chosen as the correct choice.
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Systole and diastole are the contraction and relaxation of cardiac muscle during its cycle. Even when the ventrile contraction is more potent and last longer than the atrial ones, the terms Systole and diastole are based on the contraction state of both, the atria and the ventrile. False.
What are systole and diastole?
Systole is the moment in which the heart contracts and sends blood. This contraction can occur in the ventricle or the atrium.
Atrial contraction precedes the ventricular one. Ventricular contraction occurs after the auricular one and is more potent and last longer.
During contraction, blood is ejected from the atrium to the ventricles. Then, from the ventricles to the arteries (pulmonary or aorta)
The systolic pressure can be measured at this point. This is the maximum pressure exerted when the heart contracts.
During diastole, the heart relaxes and lets blood enter the cavity.
When the muscles relax, new blood enters and fills first the atrium and then the ventricles again. And the cycle begins all over again.
Diastolic pressure can be measured at this point. This is the minimal pressure taken when the heart is at rest.
Usually, when talking about systole and diastole, we refer to the vetrincle.
According to this information, the statement is false.
The terms Systole and diastole are based on the contraction state of both, the atria and the ventrile.
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Which pair of words has one bone each from the axial and appendicular skeletons? Question 21 options: hyoid; cranium femur; tibia foramen; ramus patella; sternum
PLEASE NEED ANSWER HELPP!!! WILL GIVE POINTS !!!!!
The pair of words that has each bone from axial and appendicular skeleton is: cranium femur.
Cranium is the skull bone that protects the brain from any mechanical injury. It belongs to the axial skeleton. Femur is the thigh bone, It is the thickest, strongest, and longest bone of the body. It is the part of appendicular skeleton.
Axial skeleton is the composition of bones that make up the core of the body. There are a total of 80 bones in the axial skeleton. This includes the bones of the skull, ear, neck, back, and the ribcage. Whereas the appendicular skeleton comprises the bones of the hands and legs.
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"Survival of the fittest" means the survival of those organisms-
A) that can best cope with existing environmental conditions and live to reproduce
B) that live the longest
C) with the largest teeth
D) that have the greatest number of matings
E) which are the largest of the species
Answer:
the answer is A.) that can best cope with existing environmental conditions and like to reproduce
Coal consumption harms the environment in all the following ways EXCEPT - I NEED THIS FAST FOR NEXT HOUR PLSSS
a- Mining produces new habitats.
b- It causes acid rain.
c- It destroys animal habitats.
d- It produces sulfur dioxide when burned.
Answer: ok well, When released into the atmosphere, carbon dioxide works like a blanket, warming the earth above normal limits.
Explanation: I would say d because when it’s burned it makes a heat trapping gas.. I think. But that would be my best bet
Which statement describes where decomposers get the chemical elements they need for growth
Decomposers get their energy by eating dead plants or animals.
Decomposers are the one who break down decaying organisms, through the process of decomposition. Decomposers break apart complex organic materials into more essential substances like water and carbon dioxide, and simple compounds mostly nitrogen, phosphorus, and calcium. These Organic matter is recycled in an ecosystem by the help of decomposers.
Hence , The last of the trophic level is occupied by decomposers, such as detritivores. They feed on dead plants and animal matter and helps in recycle of the product .
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What is the main function of environmental policy? a. prevent the use of natural resources b. reduce human impact on the environment c. prevent nature from having a harmful effect on humans d. reduce the use of natural resources Please select the best answer from the choices provided A B C D Mark this and return
How can an invasive species impact a local ecosystem?A)crowding out native species B)improve ecosystem stabilityC)increasing biodiversityD)increases available habitat for native species
Invasive species can impact a local ecosystem by crowding out native species (option A), this is the case when the invasive species share the niche with native species and has the advantage of the luck of predators in that new habitat.
biology home work 8 questions
Simple diffusion and Facilitated diffusion are the two primary categories of diffusion.
Simple diffusionAn action where the substance passes across a semipermeable barrier or solution without the aid of transport proteins. For instance, bacteria use simple diffusion to transport minute nutrients, water, and oxygen into the cytoplasm.Facilitated diffusionFacilitated diffusion is the passive transfer of molecules from the area of higher concentration to the area of lower concentration across the cell membrane using a carrier molecule.
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Which Plateau leader was believed to have the power to heal the sick and change the weather?
the tribal chief
any elder
medicine men and women
any council member
The tribal chief was the Plateau leader believed to have the power to heal the sick and change the weather.
Shamanism, in which a religious figure known as a Shaman served as a bridge between the physical and spiritual realms, likewise dominated the religion, ceremonies, and beliefs of the Great Basin Indians. The Shamans possessed unique abilities, medicines, and magic to cure the ill, direct the hunt, and foretell the future.
The earliest European explorers in the area noted that the Plateau people wore a bark breechcloth or apron and a twined bark poncho that fell just below the waist. During the cold season, men wrapped their legs in fur, women wore hemp leggings, and people used robes or blankets made of rabbits or other furs.
In general, native North American faiths and plateau religions share a number of characteristics. One of these was animism, the idea that every living thing—human, animal, plant, and object—was home to a spirit. The notion that people might directly communicate with the spirit realm was another.
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George Murdoch's research indicated that which one of the following is a cultural
universal?
A.astronom
B.war
C.medicine
D.all of these
Answer:
It is option a. Astronomy
Explanation:
List and describe the substrates and products of glycolysis
Answer:
Major Steps of Glycolysis:
Glycolysis involves a sequence of steps that can be grouped into three important reactions: phosphorylation of glucose, splitting of the six-carbon molecule into two three-carbon molecules, and the energy harvesting reactions.
Answer and Explanation: 1
The products of Glycolysis are as follows:
Pyruvic Acid
Two molecules of NADH (Nicotinamide Adenine Dinucleotide)
Two molecules of ATP (Adenosine Triphosphate)
Although 4 ATP are produced, 2 ATP are spent during phosphorylation of glucose (conversion of glucose to fructose 1,6-bisphosphate), thus, there is a net gain of only 2 ATP molecules.
What are alleles? If individuals carry genes in pairs, is it possi-
ble for more than two alleles of a gene to exist?
An allele is one of at least two renditions of DNA grouping (a solitary base or a portion of bases) at a given genomic area. An individual acquires two alleles, one from each parent, for any given genomic place where such variety exists. Assuming the two alleles are something similar, the individual is homozygous for that allele.
Although individual people (and every diploid creature) can have two alleles for a given quality, numerous alleles might exist in a populace level, and various people in the populace might have various sets of these alleles.
What are the functions of Allele?
Alleles add to the organic entity's aggregate, which is the presentation of the life form. A few alleles are predominant or passive. At the point when a life form is heterozygous at a particular locus and conveys one prevailing and one latent allele, the creature will communicate the predominant aggregate.
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