Darwin's Theory of Evolution is the widely held notion that all life is related and has descended from a common ancestor Darwin's theory of evolution is based on five key observations and inferences drawn from them. These observations and inferences have been summarized by the great biologist Ernst Mayr as follows Species have great fertility. They make more offspring than can grow to adulthood. Populations remain roughly the same size, with modest fluctuations. Food resources are limited, but are relatively constant most of the time. From these three observations it may be inferred that in such an environment there will be a struggle for survival among individuals. In sexually reproducing species, generally no two individuals are identical. Variation is rampant. Much of this variation is heritable.
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