Question

Which evidence supports the theory that fish and mammals evolved from the same ancestor?
Responses pick one answer

They both emerge from fertilized eggs.
They both emerge from fertilized eggs. - no response given

Their embryos share features in the early stages of development.
Their embryos share features in the early stages of development. - no response given

Their embryos share features in the late stages of development.
Their embryos share features in the late stages of development. - no response given

They both produce egg and sperm cells that must join in fertilization.

Answer 1

The most compelling evidence that supports the theory that fish and mammals evolved from the same ancestor is:

**Their embryos share features in the early stages of development.**

This indicates a common ancestry due to the presence of similar embryonic structures, which is a key concept in evolutionary biology.