Every place on earth receives the same number of hours of sunlight each year — an average of 12 hours per day. however, the amount of solar energy received on a given day in a given location differs. what factor accounts for these differences

The answer is the tilt of earth.

Explanation:

Because the tilt of earth  affects the angle of the sun's rays and causes the seasons in temperate regions. Even though the earth is far away from the sun, the northen hemisphere is tilted toward the sun, so the solar energy is more concentrated in this area.

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.