How have people in north africa modified the environment to make it more suitable for farming

a they have constructed terraces on mountain sides to create more farmland

b they have you slash-and-burn agriculture 2 in reg the soil

c they have important crops that grow well in a dry environment

d they have used irrigation to carry water from rivers to crops

People in North Africa modified the environment to make it more suitable for farming:

D.) they have used irrigation to carry water from rivers to crops

Outside of the Nile River area, the lanf is not very fertile. This has required irrigation techniques to water crops.

the united states has a federal government. the president is the head of the federal government of the united states. however, each state forms its government for administration purposes. the powers of the state governments are exercised within restricted state boundaries. and citizens participate in this government by voting.