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Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.
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Describe the response the kidneys have to dehydration and excessive water intake. what happens to the concentration of urine in each case ?
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What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons
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Why do you think that it is better to use uranium-238 instead of carbon-14 to check the age of a roc...
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