As the crust and the upper part of the asthenosphere cool and become rigid, they form new lithosphere. This lithosphere is thin, warm, and light. This warm, light rock sits higher than the surrounding sea floor because it is less dense. It forms mid-ocean ridges.Oct 25, 2016
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Mass number can vary due to the fact that the number of neutrons can vary. Isotopes are named for their mass numbers. So, this element has 15 protons (atomic number), 15 electrons, and 16 neutrons (mass number minus atomic number). This isotope is phosphorus-31, which has atomic number 15.
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If a cell doesn't make it through the cell cycle, or doesn't pass .. It has to restart and go through G0. It's something like a loop out when they don't go through the cell cycle
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