Fishes are divided into two classes, Chondrichthyes and Osteichthyes, on the basis of
A) the chemical composition of the skeleton.
B) the structure of the jaw.
C) the structure and function of their fins.
D) their mode of reproduction.
E) the structure of the teeth.

Question

Quizplus · Accepted Answer

The primary distinction between Chondrichthyes and Osteichthyes is based on the chemical composition of their skeletons. Chondrichthyes, such as sharks and rays, have skeletons made primarily of cartilage, whereas Osteichthyes, or bony fishes, have skeletons made primarily of bone.

Fishes Are Divided into Two Classes, Chondrichthyes and Osteichthyes, on the Basis