Which species would be considered more primitive based upon the structure of their limbs?
A)bats
B)stem reptiles
C)porpoises
D)penguins
E)birds

Question

Quizplus · Accepted Answer

Stem reptiles are considered more primitive based on the structure of their limbs, as they have a sprawling gait where their limbs stick out to the side. This is the ancestral condition for most land vertebrates, including amphibians and lizards. Bats, porpoises, penguins, and birds have more derived limb structures adapted for flying or swimming.

Which Species Would Be Considered More Primitive Based Upon the Structure