ideas on the formation of living things were very different. It starts with the idea of \u200b\u200bfixism, according to which all living organisms were not changed over time and across generations, this theory was demolished by the discovery of fossils. In 1809, Lamarck proposed a theory in which he argued that a change in the environment where an organism lives and causes a change of the same formulated two principles: the principles of use and disuse, saying that a little-used part of the body disappeared and The second principle was speaking of the transmission of acquired characteristics to their descendants. Darwin, in 1859, exposed the natural selection mechanism in which there is a gradual increase in individuals with optimum characteristics for living environment.
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