Answer:
Researchers need a lot of data to monitor a species population because the environment is very diverse in types of species found at different places . 
 What happens to one part of it could affect the population of other animals, humans, and may also effect the ecosystem of that certain environmental region .
 
        
             
        
        
        
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Most eukaryotic cells that are not involved in the production of gametes undergo mitosis. These cells, known as somatic cells, are important to the survival of eukaryotic organisms, and it is essential that somatic parent and daughter cells do not vary from one another.
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Answer:
Radioactive decay means the process by which unstable nucleus of an atom spontaneously releases energy through the emissions of radiation used in dating fossils and rocks.
Relative dating mean the time required for half the atoms in an element to divide in half.
Explanation:
So radioactive decay belongs to A.
And relative dating belongs to B.
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