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Lichens are symbiotic associations between a fungal partner, usually an ascomycete, and a photosynthetic partner, either green algae or cyanobacteria. They play a significant role in ecosystems and are considered important indicators of environmental health. One of their primary ecological roles is in soil formation. Lichens colonize bare rocks and surfaces, secreting acids that chemically weather the substrate, _________ ____ _________ _____ ______ ___ ________ _________ ___ ________ _________ _____.
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