Worldviews that deny the existence of a Creator, a creation event, and the supernatural must assume some form of naturalistic evolution to explain the origin of life. Evolutionary theory takes three forms: Classical Darwinism theorizes a gradual process of changes in species by means of natural selection[4] or survival of the fittest,[5] Charles Darwin’s original thesis. Neo-Darwinism came into vogue in the 1930s, expanding Darwin’s original theory of natural selection to include change by genetic mutation. Punctuated equilibrium or punctuated evolution arose in the 1970s, theorizing that
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