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OpenStudy (anonymous):
Which best explains the circulation system within mammals? A. Mammals use a closed, single-loop circulatory system aided by a three-chambered heart. B. Mammals use a closed, single-loop circulatory system aided by a four-chambered heart. C. Mammals use a closed, double-loop circulatory system aided by a four-chambered heart. D. Mammals use an open, double-loop circulatory system aided by a four-chambered heart
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