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Every plant and animal species has a set of environmental conditions under which it will grow and reproduce most optimally. When the conditions are changed, the previously dominant species may fail and another species may become ascendant. This gradual and continuous replacement of plant and animal species by other species until eventually the community, as a whole, is replaced by another type of community is called succession. In other words, succession is the natural replacement of plant or animal species, or species associations, in an area over time. The replacement is often directional and sometimes predictable.

Successions are of two types: Primary and secondary. When the process of succession begins on a site not previously occupied by other communities, it is called primary succession. Newly formed ...

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