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Earth ScienceThe Carbon Cycle
Carbon, the fourth most abundant element in the universe, moves between the atmosphere, oceans, biosphere,...
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Math in ScienceScientific Notation
The blue whale weighs approximately 190,000 kilograms, while a plankton weighs just 0.5 milligrams—a difference...
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BiologyCell Division II
Beginning with the discovery of mitosis, the module details each phase of this cell process....
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