Explanation about Darwin’s Theory Author : www.ita.uni-heidelberg.de

Every living organism on Earth ghts for its existence (food, light, territory, and shelter) and for its successful reproduction.This eort is called the struggle for survival. In this battle, only the most successful organisms survive, a fact that is termed natural selection. An additional fact of life is that in the process of reproduction there are mutations, caused by changes of the DNA. Mutations are unavoidable and occur at random. They are caused both by the environment (chemicals, radiation, and energetic particles) and by internal processes (faulty DNA replication). Darwin’s theory (or principle) states that mutated organisms compete in the struggle for survival, with the consequence that, by natural selection, new, more ecient life forms appear. As the less capable individuals get outcompeted by the more ecient organisms a group evolves towards a population with more ecient members….. download pdf file for more explanation

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