Three living species X, Y, and Z share a common ancestor T, as do extinct species U and V. A grouping that consists of species T, X, Y, and Z (but not U or V)makes up
A) a valid taxon.
B) a monophyletic clade.
C) an ingroup, with species U as the outgroup.
D) a paraphyletic group.
E) a polyphyletic group.

Question

Quizplus · Accepted Answer

A paraphyletic group includes a common ancestor and some, but not all, of its descendants. In this case, species T, X, Y, and Z are included, but not U and V, making it paraphyletic.

Three Living Species X, Y, and Z Share a Common