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An atom that has 19 protons, 21 neutrons, and 18 electrons has a mass of ? *
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An uncomfortable feeling in the ears when descending in an airplane is caused by changes in air pressure on the: a. inner ear b. middle ear c. eardrum d. hammer/anvil
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Which of the following are causes of evolutionary change? 1)genetic drift 2) natural selection 3) gene flow 4)mutation
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An atom that has 19 protons, 21 neutrons, and 18 electrons has a mass of ? *...
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