Only a tiny percentage of organisms becomes fossils. Soft-bodied organisms are the least likely to become fossils. Quick burial is almost always essential for remains to become fossils.
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Process resulting from random motion of molecules by which there is a net flow of matter from a region of high concentration to a region of low concentration.
Very, very rare. Uranium used in power plants is typically only 3% U-235 (the explosive stuff), while bomb-grade uranium is nearly pure U-235. Simply, the concentration of U-235 in reactor-grade uranium is too small to start a chain reaction and detonate like a bomb.
Natural selection<span> and selective breeding can both cause changes in animals and plants. The </span>difference between<span> the two is that </span>natural selection<span> happens naturally, but selective breeding only occurs when humans intervene. For this reason selective breeding is sometimes called </span>artificial selection<span>.</span>
