3. why do living organisms need nutrients?

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Explanation:

Nutrients are chemical substances found in every living thing on Earth. They are necessary to the lives of people, plants, animals, and all other organisms. Nutrients help break down food to give organisms energy.The human body can also synthesize some nutrients, such as amino acids. And as the person above said "Every living organism needs nutrients to build tissues and carry out essential life functions. Like water, nutrients are passed between organisms and the environment through biogeochemical cycles. ... When organisms die, decomposers return nitrogen to the soil as ammonia."