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- In 1869 Mendeleev made this classification, which became one of the most useful and important generalizations of chemistry and science.
Question 1:
In 1869 Mendeleev made this classification, which became one of the most useful and important generalizations of chemistry and science.
A. The theory about the origin of species
B. The periodic table of the chemical elements
C. The discovery of dynamite
D. Pasteurization
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