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Vlada [557]
3 years ago
9

Please answer this if u know it, thank you❤️

Biology
2 answers:
Gnoma [55]3 years ago
7 0

Explanation:

answer refer in attachment

omeli [17]3 years ago
4 0

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.

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An abiotic factor is the exact opposite of a biotic factor: something in an ecosystem or environment that is not alive. Some examples that may be found in a city park include a park bench, a trash can, rocks, a playground, a pool, basketball court, temperature, and humidity.

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