Birds are different from all other living vertebrates because they
A)can fly.
B)lack teeth.
C)have feathers.
D)are bipedal.

Question

Quizplus · Accepted Answer

Birds are uniquely characterized by the presence of feathers, a feature that distinguishes them from all other living vertebrates. While some birds can fly (A), not all do, and other vertebrates like bats also have the ability to fly. The lack of teeth (B) is not unique to birds as some other vertebrates also lack teeth. Being bipedal (D) is not exclusive to birds, as many other animals, including humans, are bipedal.

Birds Are Different from All Other Living Vertebrates Because They