science (please please please help)

3. Nitrogen-fixing bacteria live in protective nodules (bumps) on the roots of some plants.
These bacteria are able to convert gaseous nitrogen from the air into a form of nitrogen
that the plants can use. Which type of relationship is this?
~mutualism***
~predation
~commensalism
~parasitism

I think the answer is mutualism but I'm not sure if they'd count the Nitrogen-fixing bacteria would benefit from the process or not. Please, help me

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  1. I am no biologist but suspect you are right. Obviously the plant benefits from the N2 but I do not think the bacteria would be there unless they gained something (like a home). The other choices make no sense.

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  2. Thanks, Damon, I'll go with that answer and keep you updated on whether we were correct or not.

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  3. just sent it in, it was correct. Thank you.

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  4. ;-; im lookng for an answer to so....

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  5. wait was her name Sue roberts?

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  6. 1.c
    2.d
    3.a
    4.a
    This works for connections Academy 7th and 6th

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