Which correctly distinguishes between a pine tree and an apple tree?
The pine tree bears flowers, the apple tree does not have any flowers,
The pine tree has unprotected seeds, the apple tree has seeds in fruit.
The pine tree is vascular, the apple tree is a seedless, nonvascular plant.
The pine tree thrives in warm climates, the apple tree thrives in cold climates,

climate change and pollution

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.