Energy is required for maintenance of life.
It is obtained by a process called
Metabolism
Phagocytosis
Photorespiration
Decomposition
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This question was previously asked in
UPSC NDA-1 – 2015
Metabolism includes catabolic pathways which break down complex molecules (like carbohydrates, fats, proteins) obtained from food, releasing energy in the process (primarily in the form of ATP) that is used for cellular activities and maintenance of life.