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Nitrogen-14 and nitrogen-15 are isotopes of the same element. how do these two isotopes differ? a. they have different numbers of nuclei. b. they have different numbers of protons. c. they have different numbers of neutrons. d. they have different numbers of electrons.
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What astronomers thought epicycles were correct?
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The diagram shows steps and structures involved in protein production. the arrow labeled x is pointi...
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