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Biology, 18.01.2020 06:31 diazsindy

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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Which best explains the circulation system within mammals?

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