• A scientific theory is supported by many types of evidence.
  • It is a synthesis of evidence from many experiments and observations.
  • A theory is a simple model of reality.
  • Scientists can use a theory to make predictions.
  • The theory of evolution maintains that modern humans evolved from ape-like ancestors.
  • Plate tectonics theory says that slabs of continents move around on Earth's surface.
  • As new evidence arises, any of these theories may need to be altered.
  • But none of these three are likely ever to be disproved.
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