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A mycorrhizal fungus supplying phosphorus to a plant in exchange for sugars is an example of

  • A.Competition
  • B.Antibiosis
  • C.Mutualism
  • D.Parasitism

Answer: C

Both partners gain: the plant obtains phosphorus it could not reach and the fungus obtains carbon it cannot fix, which is the definition of mutualism. Under some conditions the balance can tip and the fungus behave more like a parasite, but the association is normally mutual.

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