A review of the cladogram shows a common ancestor for these four types of vertebrates. Which statement BEST explains the genetics represented by the cladogram?

A)
There are no genetic similarities among the four distinct types.


B)
The four types of animals no longer have any genetic similarities.


C)
Lizards and snakes are more genetically alike than lizards and birds.


D)
A common ancestor indicates that the four once had identical genotypes