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A number of scientists found genes in the 18th and 19th centuries. Scientific discoveries were made one after another in the 18th and 19th centuries. Many scientists succeeded in finding out how the features of living things were passed on to the next generation in the 18th and 19th centuries. It took a long time for scientists to find out why members of the same family look like each other.
on; in in; at at; in of; on
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About the 6th century. Before the 17th century. Before the 14th century. Before the 15th century.
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About the 6th century. Before the 17th century. Before the 14th century. Before the 15th century.
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During the first half of the 18th century
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It was in the first half of the 18th century
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