Incomplete double circulations is found in:

reptiles and birds

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Amphibia and reptiles

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Birds and mammals

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Fish and amphibia

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Solution

The correct option is B Amphibia and reptiles
The correct answer is B (Amphibians and reptiles )
In amphibians and reptiles the auricles are two in number and divided into right and left auricles, but ventricle is only one and when blood reaches the ventricle both the oxygenated and deoxygenated blood get mixed up.
This is called as incomplete double circulation.

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