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Radiometric dating is used to tell the absolute age of materials by studying the decay rate of radioactive isotopes. the decay rates of isotopes are constant and are expressed as .
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In which state was more than 100 billion tons of coal mined in 2005?
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Por qué crees que los huevos con cáscara se llaman amnióticos?
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What is used to substances enter or exit the cell membrane?...
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