what does in direct respiration occur
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The indirect respiration occurs in both lower and higher vertebrates. In lower vertebrates , they use gills and in higher vertebrates , they use lungs.
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The oxidative process occurring within living cells by which the chemical energy of organic molecules is converted in a series of metabolic steps into usable energy in the form of ATP, involving the consumption of oxygen and the production of carbon dioxide and water as byproducts.
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