This symbiotic association grows on rocks,where it begins the process of soil formation,and it is a major food source for caribou.

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Lichens can grow on rocks and are known to be symbiotic associations between a fungus and algae or cyanobacteria. They can begin the process of soil formation and are a major food source for caribou. Arbuscular mycorrhizal fungi, ectomycorrhizal fungi, endophytes, and chytrids are not known to have these characteristics.

This Symbiotic Association Grows on Rocks,where It Begins the Process