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Before the 18th century, plants and animals were classified by physical appearance and nothing else. This proved to be too simplistic and during the 18th century, the classification system was expanded.
In the 18th Century.
early 18th century
I believe in the 18th century.
It is in the 1700's if they say in the 18th century.
The factory system started in the 18th century (In the Period Of The Industrial Revolution).
The metric system was introduced as part of the French Revolution, in the late 18th century.
The 17th century comes before the 18th.
in the early 18th century, in 1875.
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The 18th Century is from 1700 to 1799.
in the 18th century i think