Lichens are hardy organisms that can be found growing on rocks or trees in relatively unpolluted environments. They are often the first colonizers of landscapes that have been destroyed by fire or other natural disasters. Lichens are made up of two symbiotic organisms. They are

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Lichens are hardy organisms that can be found growing on rocks or trees in relatively unpolluted environments. They are often the first colonizers of landscapes that have been destroyed by fire or other natural disasters. Lichens are made up of two symbiotic organisms. They are