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User Sitaktif
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2 Answers

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Step-by-step explanation:

Single circulation is less efficient as gill capillaries slow down the blood flow so the body receives blood at a low pressure which decreases the oxygen supply to the cells.

Double circulation is more efficient as blood at higher pressure especially in humans and mammals

In single circulation only venous blood passes through the heart.

In double circulation mixed or oxygenated or venous blood passes through the heart.

User Losnir
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Step-by-step explanation:

answer refer in attachment

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User Howler
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