Why do a chicken embryo and a cow embryo look very similar even though the adults do not?
they are not related, but still have similar development.
they are distantly related, so their development is similar.
the embryos mutate in utero to form different structures.
the genetic makeup of the two species is similar.

Answer;

-They are distantly related, so their development is similar.

Explanation;

-Comparative embryology is the branch of embryology that compares and contrasts embryos of different species. It is used to show how all animals are related. Many things are compared (such as whether or not the organism has a notochord or gill arches).

-Embryology proves the modern theory of evolution by the similar structures found in embryos. The greater the similarity in structure, the more closely related the species are and the more recent their common ancestor is.

its probably to later but whats the question