Consider five species of toads (A-E).Species A and B are sister species.Species C and D are also sister species.The clade containing species A and B is a sister to the clade containing species C and D.Which species groups would be a clade?
A) Species A, B, and C
B) Species A, B, and D
C) Species A, C, and E
D) Species A, B, C, and D
E) Species B, C, D, and E

Question

Quizplus · Accepted Answer

A clade is a group of organisms that includes an ancestor and all descendants of that ancestor. The group of species A, B, C, and D fits this definition because they share a common ancestor and all evolved from it. Species E is not part of this clade as it does not share a common ancestor with the other four species. Therefore, the only option that is a clade is D.

Consider Five Species of Toads (A-E)