Answer:
an opening into a vessel or cavity of the body.
I believe it should match as the following...
sight in whales -----> eyeballs in cavefish
balance in monkeys -----> tailbone in humans
attachment point for limbs in frogs -----> pelvis bone in whales
the male reproductive system consists of external organs. while the female reproductive system consists of internal organs.
It is made from the glycoprotein murein.
Answer:
it is the x gene mutation
