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Although Darwin became the best-known evolutionist, the idea of evolution had been around well before him. Drawn's key contribution was to propose a mechanism that drives evolution, which is known as natural selection.
The variation in phenotypic variance-driven individual survival and reproduction is known as natural selection. The generational evolution of a population's heritable features is a fundamental mechanism of evolution. By contrasting it with artificial selection, which in Darwin's perspective is intentional whereas natural selection is not, he popularized the phrase "natural selection." Each group of species has its own unique characteristics. This happens in part because it's possible for an organism's genome to experience random mutations, which its descendants may inherit. People exhibit a variety of phenotypes as a result of their experiences and genetic composition throughout their lifetimes.
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