it was to build a series of dams to control floods and generate electricity
The answer is b hope this help I can’t really explain tho so hope it helps
Using irrigation system was the practice closely associated with most ancient river valley civilization.
I believe the answer is: positive externality
Positive externality refers to The benefit that enjoyed by a third party when the first and second party are conducting a transaction.
When you receive a vaccines, you prevent yourself from becoming a host that could contaminate other people from getting the virus. In the example above, you and your children are the first and second party. And other children are the third party.
