The rate of appearance f new life forms is linked with the life span of organism.Explain?

The rate of appearance of new forms is linked to the life cycle or the life span of an organism, is based on the theory of natural selection. For example, Microbes that divide fast have the ability to multiply and become millions of individuals
within hours. For the same thing to happen in a fish or fowl would take million of years as life spans of these animals are in years. Similarly a more fit individual will leave more fit progeny.

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