The movement of these bones causes fluid within the cochlea to move, resulting in movement of the membrane.

each of the 46 original chromosomes splits into two daughter chromosomes, so there are two sets of 46 daughter chromosomes that end up in each cell. human cells have 46 chromosomes. each chromosome consists of a pair of identical chromatids attached together by a structure called a centromere.

the fossil record provides evidence of a common ancestor to many species.