Question

4. How do plants get nitrogen?
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Answer 1

when the planets were formed an envelope of gase developed arount the planets, most of it being nitrogen

Explanation:

Answer 2

Plants take nitrogen from the soil by absorption through their roots as amino acids, nitrate ions, nitrite ions, or ammonium ions. Plants do not get their nitrogen directly from the air. ... Plants get the nitrogen that they need from the soil, where it has already been fixed by bacteria and archaea.