When wood or coal burns or decays, or when living things perish ... whether in the ungovernable confla gration or the measured respiration of the living animal. Carbonic acid is a heavy gas ...
Most living things depend on photosynthetic cells to ... such as glucose. Then, via respiration processes, cells use oxygen and glucose to synthesize energy-rich carrier molecules, such as ATP ...
The glucose can also be broken down in the plant by respiration ... Photosynthesis is important to living organisms because it is the number one source of oxygen in the atmosphere.