Which of the Following Groups Includes the Greatest Number of Organisms

Question

Which of the following groups includes the greatest number of organisms?
A) osteichthyans
B) amphibians
C) gnathostomes
D) lobe-fins

Accepted Answer

Gnathostomes include all vertebrates with jaws, encompassing a vast majority of fish, amphibians, reptiles, birds, and mammals, making it the largest group among the options listed.