<u><em>The answer is</em></u>: <u>Nitrogen fixation and Assimilation.</u>
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Explanation:
<u>Nitrogen fixation</u>: <em>it consists of the conversion of gaseous nitrogen (N2) into ammonia (NH3), a form that can be used by organisms.</em>
Plants through <u>ASSIMILATION</u>, <em><u>can take ammonium</u></em> <em>and nitrate through the roots and can use them</em> <em><u>for the synthesis of their proteins</u></em> <em>and nucleic acids.
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<u><em>The answer is</em></u>: <u>Nitrogen fixation and Assimilation.</u>
Nitrogen fixation converts atmospheric nitrogen into ammonium, which plants absorb. The plants, by assimilation, incorporate the ammonium into proteins.