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Q. What is the difference between primary ecological succession and secondary ecological succession?
The Primary ecological succession is the changing sequence of communities from the first biological occupation of a place where previously there were no living beings. For instance, the colonization and the following succession of communities on a bare rock.
The Secondary ecological succession is the changing sequence of communities from the substitution of a community by a new one in a given place. For instance, the ecological succession of the invasion of plants and animals in an abandoned crop or land.
A species of trilobite was found in the fossil record. At its first appearance, it is similar to an ancestor species but differs from the ancestor in several key characteristics. I
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