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ChemistryThe Periodic Table of Elements I
The modern periodic table is based on Dmitri Mendeleev’s 1896 observations that chemical elements can...
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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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Earth ScienceThe Hydrologic Cycle
Powered by the sun, water constantly cycles through the Earth and its atmosphere. This module...
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