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Adaptation to the environment, heritable variation and variation in reproductive success are components of natural selection.

Natural selection requires the occurrence of four factors are reproduction, inheritance, variation in organism fitness, and variation in individual traits among population members. Reproduction is the process or act of having children. A parent plant must produce more offspring than it can ordinarily support for evolution to take place. The process by which particular characteristics or features are passed from one parent to the next is known as heredity. Variation in an organism's fitness is measured by the average number of offspring that members of a particular genotype typically produce in comparison to members of other genotypes.

Hence, natural selection requires both individual fitness and environment.

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