Which of these must be converted from an atmospheric gas into a form that plants can take up from soil?

Name: Which of these must be converted from an atmospheric gas into a form that plants can take up from soil?
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Question

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Nitrogen in the atmosphere is in the form of N2, which most plants cannot use directly. It must be converted into ammonia (NH3) or nitrate (NO3-) through a process called nitrogen fixation before plants can absorb it through their roots.

Which of These Must Be Converted from an Atmospheric Gas