The first principle is microevolution, the occurrence and build-up of mutations in the genetic sequence of an organism. Mutations are predominantly random and can occur naturally through errors in the reproductive process or through environmental impacts such as chemicals or radiation.
The second principle of evolution is natural selection. Natural selection is a natural mechanism by which the fittest members of a specie survive to pass on their genetic information, while the weakest are eliminated because they are unable to compete in the wild.
The third tenet is speciation, which occurs when members of a specie mutate to the point where they are no longer able to breed with other members of the same species. The new population becomes a reproductively isolated community that is unable to breed with its former community.
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