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    Benefits to Higher Animals

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    I'm trying to figure out, of what benefit are a closed circulatory system, closed digestive system, an excretory system, and a nervous system, to higher animals?

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    https://brainmass.com/biology/animal-biology/benefits-higher-animals-33390

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    A closed circulatory system allows more of a complete separation of function than an open circulatory system does. The blood volume in these animals is considerably lower than that of animals with open circulatory systems. In animals with closed circulatory systems, the heart is the chambered organ that ...

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    The solution discusses what benefits are a closed circulatory system, closed digestive system, an excretory system, and a nervous system, to higher animals.

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