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