Which of the following facts is the best evidence that humans and salamanders had a common ancestor? A) Both species eat meat
B) Both species have pharyngeal arches and slits when they are embryos
C) Both species can swim
D) Both species have skin

B

Explanation:

Look up an image of a human embryo v. a salamander embryo if you look carefully you'll see the arches and slits.

a motor homunculus represents a map of brain areas dedicated to motor processing for different anatomical divisions of the body.

homunculus represents the importance of various parts of your body as seen by your brain. as a result, they take up a lot of brain space. although the cortical homunculus is a curiosity, penfield's work in mapping the brain's relationship to the body was invaluable.

answer: the answer is b