When absorbed energy is released back into space, Earth cools. Many factors, both natural and human, can cause changes in Earth's energy balance, including: Variations in the sun's energy reaching Earth. Changes in the reflectivity of Earth's atmosphere and surface.
The answer is D. The sugar belongs to carbohydrates. The lipids is consisted of glycerol and fatty acid. The proteins is consisted of amino acids. The nucleic acids is consisted of nucleotide.
