Answer: In cells, chemical energy is gradually released in a series of chemical reactions that are assisted by enzymes. ATP--when cells break down food molecules, some of the energy on the molecules is released as heat. Cells use much of the remaining energy to make ATP.
website: Explanation: http://www.wctech.org/www.wctech.org › wcts › Staff › chapter 9 photosynthesis & cellular res..
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The answer is Complement
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