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Exchange with the environment Definitions * Heterotrophic Organisms: These obtain their carbon in the form of ready-made complex organic substances, such as glucose. * Catabolism: This is the process of the breakdown of complex substances into simpler ones, such as the breakdown of glucose to carbon dioxide and water, in the process of cell respiration. * Autotrophic Organisms: These can make complex organic compounds from simple inorganic substances, such as carbon dioxide and water. Exchange processes * Living organisms constantly need to exchange materials with the environment in order to survive and grow. * Organisms need to respire to release energy from their food. * Most organisms take up oxygen from the environment and, as a consequence of the catabolic reaction involved, release carbon dioxide as a waste product. * Heterotrophic organisms require a ready-made source of food, which they obtain from their environment. This food consists of complex organic compounds, which need to be digested into simple, soluble...

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