Lichens in a forest ecosystem are made up of fungi and algae living together. The fungi benefit from food produced by the algae. The algae benefit from nutrients and water absorbed by the fungi. Which of the following relationships in different ecosystems is most similar to the interaction of the fungi and algae?

A.mutualism between fungi and ants

B.parasitism between fungi and humans

C.commensalism between birds and trees

D.competition between algae and aquatic plants

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