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Why do we need energy?

By User
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To function in the human body, energy behaves as fuel to it.
Energy helps to warm as well as cool down the human body.
Energy is essential for external activities functioning in the physical world and for the internal body as well (like to produce, repair and function the body cells and tissues).
This energy can be produced from the food we intake.

Final Answer:

Hence, we need energy for survival.

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