The diagram shows embryo development of four different animals.
iS How is this evidence used to suggest that life changes over time?
The genetic inheritance of each of of these species is
exactly the same in the early
stages of development
but then changes as the embryo grows and develops
over time.
Similarities in embryonic development prove that
vestigial structures are common to all species, and life
has changed very little over time.
Lack of homologous structures in later
stages of
embryonic development indicate that each species IS
unique, and a common ancestor
is unlikely.
When there are physical similarities in the early stages
of embryonic development, it suggests that each of the
modern organisms once had a common ancestor.