PLSSS HURRY IM ON A TIMER TH Early civilizations changed their natural environments by:

A. digging canals to control the flows of rivers
B. using slash and burn agriculture to help forests grow
C. Using terrace farming to make the soil more fertile
D. draining all the water out of large rivers

Opposition to the nra came to a head in 1935, when the conservative supreme court declared the agency unconstitutional, claiming the nra gave the executive branch regulatory powers that belonged exclusively to congress. this decision began a series of court decisions that overturned key elements of the new deal.