Easy. Because the tilt of the earth, and because the of the distance the earth is from the sun, either more light hits the earth, or less light hits it. This becomes the basis for winter and summer solstices. This also becomes the reason why the seasons change (as the ecosystem begins to accommodate to the changes in energy disposition)
Carbohydrates, lipids, proteins, and nucleic acids
<span>A. Unsaturated fatty acids have double carbon bonds</span>
Answer: The right ventricle receives deoxygenated blood, The left ventricle receives oxygenated blood from the left atrium
Explanation:
