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The element nitrogen has the atomic number 7 and an atomic mass of 14. how many neutrons does an atom of nitrogen contain?
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Texas bluebonnet plants seen in this photo are an example of which ecological unit?
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On a spring day, a middle-latitude city (about 40? north latitude) has a surface (sea-level) temperature of 10 ? c. if vertical soundings reveal a nearly constant environmental lapse rate of 6.5 ? c per kilometer and a temperature at the tropopause of –55 ? c, what is the height of the tropopause?
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The element nitrogen has the atomic number 7 and an atomic mass of 14. how many neutrons does an ato...
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