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Why do cells need oxygen?

To produce movement

To generate heat

To provide energy

Cells need oxygen to provide energy through cellular respiration, in which glucose and oxygen are used to produce ATP, the main source of energy for cells. Options A and B are incorrect because cells do not produce movement or generate heat through the use of oxygen. Option D is incorrect because while oxygen is used in a variety of metabolic reactions, it is not required to "complete" them.

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To complete complex metabolic reactions

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