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Name the pioneer species on a bare rock....

Name the pioneer species on a bare rock. How do they help in establishing the next type of vegetation? Mention the type of climax community that will ultimately . get established

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Lichens are pioneer species on a bare rock.
They secrete certain acids, which help in weathering of rocks and soil formation. It gives way to small plants like bryophytes, which can take hold in the small amount of soil. The climax community will be a forest.
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