Which innovation(s) places birds in a separate class?
A) wings only
B) high metabolic rate
C) wings and flight
D) high metabolic rate and dry skin
E) wings, flight, and high metabolic rate

Question

Quizplus · Accepted Answer

Birds are distinguished by their combination of wings, flight capability, and high metabolic rate. While other animals may have one or two of these characteristics, the combination of all three is unique to birds.

Which Innovation(s) Places Birds in a Separate Class