Question

nitrogen becomes usable to plants through nitrogen fixation. who is responsible for nitrogen fixation?
□ plants
□ bacteria
□ the atmosphere
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Explanation:

Nitrogen fixation is the process of converting atmospheric nitrogen into a form usable by plants. Certain bacteria (like rhizobia in root nodules of legumes) perform nitrogen fixation. Plants can't fix nitrogen themselves, and the atmosphere just contains nitrogen gas, not the usable form. So bacteria are responsible.

Answer:

bacteria (the checkbox next to "bacteria" should be selected)