A circulatory system's sophistication A) is often correlated with a species' need for gas transport. B) is often correlated with a species' need for food transport. C) is not correlated with any metabolic functions. D) varies depending on the current environment conditions an organism lives in. E) depends on the amount of CO₂ in the lungs.

Question

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The sophistication of a circulatory system is often correlated with a species' need for gas transport. This is because a more complex circulatory system is necessary to efficiently transport oxygen and carbon dioxide to and from tissues in organisms with high metabolic demands.

A Circulatory System's Sophistication