Can you explain the lichens, Biology

Q. What are the lichens? How fungi participate in this ecological interaction?

Lichens are formed by mutualist ecological interaction between algae and fungi or between fungi and cyanobacteria. In this ecological interaction, the fungi absorb water that is then used by algae or cyanobacteria and algae or cyanobacteria as autotrophs, produce organic material in excess to serve as food for the fungi.

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