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All cells in our body need oxygen to create energy efficiently. When the cells create energy, however, they make carbon dioxide. We get oxygen by breathing in fresh air, and we remove carbon dioxide from the body by breathing out stale air.
Oxygen is essential for burning food . And we need it to burh our food to produce energy.
Oxygen is essential for burning of food and breakdown of food in our body is done by oxygen . So to gwt energy we use oxygen.