What facts are true about the mammalian heart?

Mammalian hearts pumps blood round the body and

It consist of four chamber( Right auricle,left auricle,Right ventricle and right ventricle). The right and left auricle makes up the right heart while the left auricle and ventricle makes up the left heart.

Explanation:The heart circulates blood through two pathways: the pulmonary and the systemic circuit.

Pulmonary arteries takes in oxygenated blood from the lungs and the veins carries out deoxygenated blood.

the genotypes would be 50% bb and 50% bb

the phenotypes would be 50% brown and 50% white. hope this : )

"a.) well–developed vascular system."