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To establish the age of a rock or a fossil, researchers use some type of clock to determine the date it was formed. Geologists commonly use radiometric dating methods, based on the natural radioactive decay of certain elements such as potassium and carbon, as reliable clocks to date ancient events.
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Limbless Vertebrae
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<span>The force driving simple diffusion is the concentration gradient while the energy source for active transport is adenosine triphosphate or also known as ATP. This are use during the conversion of food to energy.
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to keep life going even as the environment changes
