D. to better see the external structures
Depending is there something at the bottom that could catch him
Bipolar disorder to control psychotic symptoms such as hallucinations, delusions, or mania symptoms. These symptoms may occur during acutemania or severedepression
"An allele frequency
<span> changes in a population" would be the best option. The other options are one-off incidents that can be explained by simple mutations alone, not necessarily evolution. </span>