An ecosystem is composed of only one community. Please select the best answer from the choices provided

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F

2%? i tried finding the exact sorry if it's not 100% correct ; -;

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.