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   ocr: ExCRETION T: HE take place CHEMICAL inside reactions cells that produce of also excrete photosynthesis, oxygen, a during waste the day. product waste products. Getting rid ofthese Animals need to get rid of waste from isc called excretion. the breakdown ofexcess proteins in Excretion is necessary because ifthe their diet. Expelling waste matter after waste products were allowed to build digestion is egestion, not excretion. up, they would poison and kill the organism. Plants andanimals excrete carbon dioxide from respiration. Plants Breath Egestion Animal excretion Horses excrete carbon diaxid ...