What effect did agricultural tools have on the development of cities? a agricultural tools could be used to dig holes for house building. b agricultural tools allowed early humans to grow a surplus of food, thus freeing up time to build settlements that grew into cities. c agricultural tools needed to be made by an expert. humans gathered near the expert and settlements developed. d settlements developed so humans would not have to travel far to trade their agricultural tools.

Which statements describe sustainable development? multiple answer choice -fishing does not remove more fish from water systems than can be replaced by the number of fish that will be born to replace them. -sustainable development is development that is designed to improve the economic conditions in less-developed countries. -sustainable development is mainly a regional issue. -sustainable development means water is used at a rate that won't reduce the amount available for future use. - sustainable development policies only need to be concerned with environmental protection. - trees cannot be cut down faster than the number that will be replaced by new growth.