Answer:
It may vary because of the climate of that region or also the physical conditions, also the type of plants found there
One main reason is human influence 
Explanation:
 
        
             
        
        
        
The answer is prime mover
        
             
        
        
        
Its B 
because you know how much time each of them are getting 
so hope this helps:)
        
                    
             
        
        
        
<span>The first enzyme is reverse transcriptase. The concept of
reverse transcription was much unknown at first.  A reverse transcriptase is an enzyme used to
generate complementary DNA (cDNA) from an RNA template, a process termed
reverse transcription. It is mainly associated with retroviruses. As it
contradicted the central dogma of molecular biology, which states that DNA is
convert into RNA, which is then translated into proteins.</span>