_________ is used for respiration in living organisms which reacts with food and releases energy.

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Solution

Oxygen:
Respiration is essential for every living organism, the food or the carbohydrate is broken down with the help of oxygen into carbon dioxide and water.
This breakdown of food releases energy.
Oxygen is very much essential in the process of respiration, the organism that needs oxygen for respiration are termed aerobes.
The organism which does not need oxygen is known as anaerobes.
Final answer: Oxygen is used for respiration in living organisms which reacts with food and releases energy.

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