A fungus on the roots of a plant helps the plant absorb nutrients it needs from the soil, while the fungus gets what it needs from the plant. What type of symbiotic relationship is this?

Both organisms benefit: the fungus helps the plant absorb nutrients from the soil, and the fungus receives what it needs from the plant. A symbiotic relationship in which both organisms benefit is called mutualism, so the correct choice is mutualism.

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