The endocrine system is a collection of glands that regulate your metabolism, growth, sleep, mood and other things around your body.
        
                    
             
        
        
        
By the animal adapting they are able to reproduce more efficiently
        
             
        
        
        
A gene mutation is a permanent alteration in the DNA sequence that makes up a gene, such that the sequence differs from what is found in most people. ... Acquired mutations in somatic cells (cells other than sperm and egg cells) cannot be passed to the next generation.
        
             
        
        
        
 chemistry of the nitrogenous bases are really the key to  function the DNA<span>.  something called complementary base pairing. cytosine can forms three hydrogen </span>bonds<span> with guanine, and </span>adenine<span> can form two hydrogen </span>bonds<span> with thymine.</span>
        
                    
             
        
        
        
I don’t know cuz that’s hard