Question

embryology supports common descent because: all embryos look completely different at every stage. embryos only develop in related species. embryos have the same size. similar stages of development indicate shared ancestry

Explanation:

Embryology shows that embryos of different species have similar stages of development. This similarity indicates that they share a common ancestor. For example, in the early stages, many vertebrate embryos have similar structures like gill - slit - like structures. If all embryos looked completely different at every stage (first option), it would not support common descent. Embryos develop in many species, not just related ones (second option is wrong). Embryos do not have the same size (third option is wrong). The key concept is that similar developmental stages imply shared ancestry.

Answer:

Similar stages of development indicate shared ancestry.