Due ! how was english parliament in the 18th century an example of a bicameral legislative branch?

Bicameral system, a system of government in which the legislature comprises two houses. The modern bicameral system dates back to the beginnings of constitutional government in 17th-century England and to the later 18th century on the continent of Europe and in the United States.

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a. poison gas was sprayed over battlefields by airplanes to weaken enemy positions before major attacks.