Which of the Following is an Ancestral Characteristic for All

Question

Which of the following is an ancestral characteristic for all placental mammals?
A)having a tail
B)walking on four legs
C)giving birth to live young
D)having antlers
E)having thumbs

Accepted Answer

An ancestral character is shared by the ancestor and all its descendant lineages.For placental mammals,giving birth to live young is the ancestral character.