Answer:
The general plan of embryo development is similar because animals share a recent common ancestor.
Explanation:
In animal evolution, embryology plays a central role because all animal embryos derive from a fertilized egg (zygote) which suffer almost identical biological processes during the early stages of development, regardless of the species it belongs. It is important to note that the similarity level between animal embryos is higher when these species have a more recent common ancestor (more phylogenetically related)