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Secondary and primary ecological succession

Write down the difference between secondary ecological succession and primary ecological succession?

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Primary ecological succession is altering sequence of communities from first biological occupation of place where previously there were no living beings For instance, the colonization and the following succession of communities on bare rock.

Secondary ecological succession is the altering sequence of communities from substitution of a community by new one in a given place for instance, the ecological succession of invasion of plants and animals in abandoned crop or land.

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