Theory of evolution
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The theory of evolution mainly concerns the idea of evolution in biology, that is, it offers an explanation for the apparent gradual appearance of various species of life on earth over hundreds of millions of years (see fossil record). This theory is connected with ideas about "origins" - how life began on earth, how the earth came into being, and how all matter in the universe began.
While biological evolution is often a point of narrow focus, neglecting the question of how life started on Earth, some of the thinking about the appearance of new species is related to ideas about the origin of life.