0:57 minutes
Problem 4a
Textbook Question

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 monophyletic taxon. b. an ingroup, with species U as the outgroup. c. a paraphyletic group. d. a polyphyletic group.

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