The illustration above depicts different embryological stages of 4 different vertebrates.

Choose all the true statements concerning embryological development of these four species.

A. The embryos look similar, regardless of the organism All vertebrates evolved from the tortoise
B. The similarity in the embryos suggest that they share a common ancestor
C. Of the four organisms, the calf and the human are most closely related
D. Of the four organisms, the tortoise and the human are most closely related