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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