The three major achievements formed by natural sciences in the 19th century: the cell theory, the law of conservation and transformation of energy and the theory of evolution. In the 19th century, some major fields of natural science have successively entered from the empirical field into the theoretical field. Although a series of important discoveries have taken place in the fields of astronomy, geology, physics, chemistry and biology, the “three major discoveries” were the most representative achievements among them. . .
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