B, the discovery of new evidence resulted in changes to the cell theory,
Answer - C
Snakes periodically shed their skin in order to regrow new skin. Birds migrating to the south and bears hibernating are also a result of normal periodic transitions. However, extinction of a type of shrimp is most likely a result of a drastic change in the environment.
The nucleotide adenine forms a bond only with the nucleotide thymine. Therefore, if 13% of the DNA strand is adenine, 13% of the DNA strand will be thymine. Therefore, the correct answer is a: 13%.
