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By using the floods for the rich soil
they used a series of complex drainage systems that are like wells that they placed around the civilization
The introduction of 'Collective farming' .
They both used a strong central government to control the people. They also used standardized coins to help with trade that unified all the people.
One of the methods were gas chambers.
well they have the government for that
In the Spanish West Indies, methods of slave control included physical punishment such as whipping, branding, and mutilation, as well as psychological control through fear and intimidation. Slaves were also subjected to strict surveillance, restricted movements, and limited access to resources to reinforce their subjugation and prevent rebellions.
monetory policy and fiscal policy both methods are used to control unemployment rate.
Milky spore, as a type of insecticide, is a method that is used to control Japanese beetles.
By using the floods for the rich soil
Travel, transport, water, fishing, hunting, trade, and the annual floods made the land fertile and farmable.
Handwashing!
Contraception is defined as methods or devices used to avoid getting pregnant. Birth control means the same thing. Therefore, all birth control methods are used for contraception.
The methods to control the fuel and air mixture in a carburetor include needle valves to control fuel flow, and the butterfly or ventura to control air flow.
"Contraceptive" and "birth control" are synonymous. All contraceptives are methods of birth control.
Changing the sediment load of a river
growing plants and control the pollution