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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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Process of ScienceTheories, Hypotheses, and Laws
Theories are not based on one scientist's work but on an accumulation of evidence and...
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BiologyCell Division I
Cell division is an enormously complex process that must go on millions and millions of...
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