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The number and kinds of organism is not ...

The number and kinds of organism is not constant. How do you explain this statement?

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The number and kind of organism is not constant, because of the following reasons Mechanisms adding new organisms by
(i)Sexual reproduction (ii) Mutation
(iii) Evolution
Mechanisms reduing the number of organisms are
(i) Environmental threats (ii) Loss of habitat
(iii) Anthropogenic activities
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