Biology Body Fluids and Circulation Circulatory Pathways and Human Circulatory System Single Correct MCQ
Published on: August 12, 2026

Incomplete double circulation is found in

A
Amphibia and
B
Reptiles
C
Fishes
D
Both

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Amphibians and reptiles have an incomplete double circulation.
Two atria and one ventricle make up its three-chambered heart.
When oxygenated and deoxygenated blood enters the left and right atriums, respectively, and mixes in the single ventricle, this is known as incomplete double circulation.

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