Fishes have a two-chambered heart, a single atrium, and a single ventricle.

Name: Fishes have a two-chambered heart, a single atrium, and a single ventricle.
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Fishes, specifically those in the class Osteichthyes (bony fishes) and Chondrichthyes (cartilaginous fishes), have a two-chambered heart consisting of one atrium and one ventricle, which is part of their single-circuit circulatory system.

Fishes Have a Two-Chambered Heart, a Single Atrium, and a Single