The main and most important theory for evolution is Darwinism, and it defends that there are two main causes for evolution to happen: DNA modifications and natural selection. Sometimes when DNA is being copied and pasted some errors occur and if this error doesn't kill the animal, it will carry on with evolution. Natural selection makes unadaptable species disappear, so only the most adaptive animals survive. This theory was developed by Charles Darwin, a British biologist and geologist. Darwin's theory was based on Lamark's theory and developed it.
There are other theories like creationism that defend the religious view of human creation. They believe that God created Adan and Eve and put them in the paradise, until they were kicked out of there.
There has been a great controversy through the years between this two theories.
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