Which option correctly identifies the number of chromosomes in the cells at each point?

cell p contains 60 chromosomes, cell q contains 30, and cell r contains 15.

cell p contains 60 chromosomes, cell q contains 30, and cell r contains 30.

cell p contains 30 chromosomes, cell q contains 30, and cell r contains 15

cell p contains 60 chromosomes, cell q contains 60, and cell r contains 30.

d

explanation:

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.