Traditional classifications tended to take into account primarily - (A.) Extinct organisms
(B.) RNA similarities
(C.) DNA similarities
(D.) Visible similarities and differences

it cools slower in the earth meaning the crystals have more time to form than lava on the surface

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.

this would be a math