sweetie666 sweetie666

04-05-2018
Biology

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Why don’t some small aquatic animals need a circulatory system?

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roslynatudoroae roslynatudoroae

04-05-2018

Living cells need to absorb nutrients and oxygen and to release waste products, such as carbon dioxide. Some animals are small enough to do this by diffusion from their surface and do not require a circulatory system.

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