The nucleus of the cell is responsible for: a. altering and packaging proteins and lipids. b. controlling the activities of the cell. c. converting light energy into food energy. d. breaking down molecules to produce energy.

i think the answer is 95 hope this

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.