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Why do flowers and trees need oxygen?
The cells of flowers and trees need oxygen for aerobic respiration, which releases a lot of energy to support various life activities of cells, so flowers and trees need oxygen.

Aerobic respiration refers to the process that cells, with the participation of oxygen, thoroughly oxidize and decompose organic substances such as glucose through the catalysis of various enzymes, producing carbon dioxide and water, releasing energy and producing a large amount of ATP.

Aerobic respiration is the main form of respiration of higher animals and plants, and the usual respiration refers to aerobic respiration. Aerobic respiration is carried out in the cytoplasm matrix and mitochondria, which is the main place for cells to carry out aerobic respiration.