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.

THIS USER ASKED 👇

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.

THIS IS THE BEST ANSWER 👇

A. Mammals use a closed, double-loop circulatory system with the assistance of a four-chamber core.

Four mammary glands are divided into two atria and two ventricles. A double loop circulatory system is used. One loop for oxygenated blood, the other loop for deoxygenated blood.