• Charles Darwin published a book on evolution in 1859 titled On the Origin of Species.
  • In the book, Darwin stated the theory of evolution by natural selection.
  • He also presented a great deal of evidence that evolution occurs.
  • As living things evolve, they generally become better suited for their environment.
  • This is because they evolve adaptations.
  • Evolution explains how living things are changing today and how modern living things have descended from ancient life forms that no longer exist on Earth.
  • Some people think that evolution explains how life changed after it first appeared.
  • In fact, the theory suggests humans evolved from modern apes.
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