Your prehistoric body

Evolution by natural selection is a curious thing. There are lots of interesting vestiges from other species that can be found in our bodies. Even if they serve no function.
Watch the video below. What parts of the body does it NOT mention?

a) arms
b) eyes
c) ears
d) heart
e) skin

What other part of the body does it mention?

Conditional sentences are important

Really important.

(click on the image to make it larger)