In mammals, the presence of four limbs is ________, and hair is ________.
A) a shared derived character; a shared ancestral character that places mammals in the tetrapod clade
B) a shared ancestral character; a shared derived character unique to mammals
C) a homologous feature; an analogous feature
D) monophyletic; parsimonious

Question

Quizplus · Accepted Answer

Four limbs are an ancestral characteristic that is shared among many taxa, including amphibians, reptiles, birds, and mammals. However, hair is a derived characteristic that is unique to mammals and distinguishes them from other vertebrates.

In Mammals, the Presence of Four Limbs Is ________, and Hair