Animals of the class___________ have two-chambered hearts.

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Solution

Animals of class Pisces have two-chambered hearts. The heart has an atrium and a ventricle. Fishes have simple circulatory systems. The blood circulates only once through the heart in the fish during one cycle of passage through the body. The blood is pumped to the gills, is oxygenated there, and passes directly to the rest of the body.

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An animal having double circulation in a three-chambered heart is :
(a) fish
(b) snake
(c) deer
(d) sparrow

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