Which of the Following are the Most Abundant and Diverse

Question

Which of the following are the most abundant and diverse of the extant vertebrates?
A) ray-finned fishes
B) birds
C) amphibians
D) nonbird reptiles
E) mammals

Accepted Answer

Ray-finned fishes are the most abundant and diverse of the extant vertebrates, with over 30,000 species known. Birds, amphibians, nonbird reptiles, and mammals have far fewer species in comparison.