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Why do plants need nutrients?
Answer 1:

Plants get three elements from the air: hydrogen, carbon, and oxygen. There are four other elements that make up plant bodies: nitrogen, magnesium, phosphorous, and sulfur. Plants with some bacteria can get the nitrogen out of the air, but the other three aren't found in air. Thus the plant needs to get them out of the soil (or by eating insects, like a Venus fly trap - animal bodies do contain these elements!).



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