If you look at the forms of virtually every animal alive today, the early embryo stages are virtually identical. This shows that they evolved from the same ancestor. If you look at the limbs of a lot of animals, and even the limbs of fossils, they have virtually the same structure. | If you look at the forms of virtually every animal alive today, the early embryo stages are virtually identical. This shows that they evolved from the same ancestor. If you look at the limbs of a lot of animals, and even the limbs of fossils, they have virtually the same structure. |