Chemistry

Jimena

21 February, 13:16

Which best explains the circulation system within mammals?

A. Mammals use a closed, single-loop circulatory system aided by a four-chambered heart.

B. Mammals use a closed, double-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.