All other organs, ducts, and glands in the reproductive system are considered secondary, or accessory, reproductive organs. These structures transport and sustain the gametes and nature the developing offspring. 
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<span>Carbon is the only element that can form many different compounds. Each carbon atom can form four chemical bonds to other atoms. This allows it to form rings and chains.</span>
        
             
        
        
        
Answer:
A chain sequence of amino acids..
if my answer helps you than mark me as brainliest
 
        
             
        
        
        
A. animal can fly; AA. animal can't fly. That should be the correct answer. I hope that this helps you!