Which are the first organism to colonise on a barren rock?
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Lichens are typically the first organisms to colonize bare rock.
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lichens
Primary succession begins in barren areas, such as on bare rock exposed by a retreating glacier. The first inhabitants are lichens or plants—those that can survive in such an environment. Over hundreds of years these “pioneer species” convert the rock into soil that can support simple plants such as grasses.
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