An evidence of a common ancestral for fishes, amphibians, reptiles, birds and mammals is the?

A. possession of wings by birds and bats
B. cold-bloodedness of fishes, amphibians and reptile
C. presence of gills clefts in vertebrate embryos
D. possession of scale by fish and reptiles

Correct Answer:

Option C – cold-bloodedness of fishes, amphibians and reptile