How many chambers are present in the heart of a fish?

The heart of a fish is

How many chamber are present in heart of class Amphibia members?

(a) Name the red pigment which carries oxygen in the blood (b) Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds ? (c) How many chambers are there in the heart of : (i) an amphibian, (ii) a mammals, and (ii) a fish ? (d) Describe the circulatory system in a fish.

How many chambered heart is present in the aves?

Assertion : In fishes, heart is venous. Reason : Only veins are present in the heart of fishes.