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Georges Buffon actually said that living things do change through time.
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He believed that evolution has occurred in living things, including humans, but he only had rather fuzzy ideas about what might be responsible for this change.
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Lamarck believed that microscopic organisms appear spontaneously from inanimate materials and then transmute, or evolve, gradually and progressively into more complex forms through a constant striving for perfection
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Species come and go through time, while they exist they change. Organisms are descended from one, or several common ancestors and have diversified from this original stock. The diversification of life involves populations of one species diverging until they become two separate species; this has probably occurred billions of times on earth!
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Evolutionary change occurs through incremental small changes within populations; new species are not created suddenly. Evolutionary change occurs through variation between individuals; some variants give the individual an extra survival probability.
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Alfred believed that natrual selection could not explain the human intellect.