I believe the answer would be <span>The musculocutaneous nerve innervates the flexor </span>muscles<span> of the </span>arm<span>, including the biceps brachii and brachialis </span>muscles<span>. ... Along the anterior of the </span>forearm<span>, the median and ulnar nerves </span>supply<span> nerve signals to the </span>skin<span> and to the flexor </span>muscles<span>of the </span>hand<span> and fingers.</span>
common descent means the evolutionary in biology and how they have something linked with their common ancestors.
Phenotype; The expression of a particular trait, for example, skin color, height, behavior, etc., according to the individual's genetic makeup and environment.
