What can be said about species that have similar body structures and share developmental patterns?

Question

They share a common ancestor.

They produce the same fossils.

They are actually only one species.

They have drastically different DNA.

Answer 1

These species likely have a close evolutionary relationship. Their similar body structures and shared developmental patterns indicate that they may have evolved from a common ancestor and share a common evolutionary history. Despite potentially having some differences in their DNA, the similarities in their physical characteristics and developmental processes suggest that they are closely related species.