DNA probably. It might be one of the latter rungs too, thymine, and 2 others I forgot
<span>The challenge of reproducing is one of important manners which distinguishes migratory birds from another birds. The question is that which examples descrbe such manners, and for that, we can choose A, C and D</span>
Answer:
A.
Explanation:
survivors may develop huge psychological problems due to the remaining options in the question