Human embryo link to fish ancestors
Scans of human embryos have been used to construct this digital time-lapse video of how the human face develops from age one month to 10 weeks.
The early human embryo looks very similar to the embryo of any other mammal, bird or amphibian - all of which have evolved from fish.
Your eyes start out on the sides of your head, and have to move into the middle. The top lip along with the jaw and palate rotate from the neck where they originated as gill-like structures. Your nostrils and the middle part of your lip come down from the top of your head.
READ MORE: Human clues to our fish ancestry
Inside the Human Body is on BBC 1 on Thursdays, 9pm, from 5 May.