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Lichens are a group of tiny structures.They are generally formed by symbiotic adaptation between algal and fungal members.Algal component is called phycobiont and fungal member is called mycobiont.Algae prepare food for itself and fungal member.In turn fungal member gives residence and protection to algal member. It helps in formation of soil.They form huge colonies on big rocks and break or degrade them into soil.Also many birds use lichens to decorate their nests in order to attract their females.

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