Which is true of the development of western land, timber, gold, and oil?

all had a negative environment impact.
all were abundant, renewable resources.
all were carefully regulated.
all had been exploited by native americans.

All had a negative environment impact.> TRUE!

The exploitatoin of these resources modified greatly the land and/or the air negetively.

All were abundant, renewable resources ---> they are  not renewable resources

All were carefully regulated ---> there were not regulations when exploitation started

All had been exploited by Native Americans ---> Native Americans didn't exploit those resources. Settlers did.