Please help me with the answers

i think that d. wind is the answer.   i missed the question when i answered a. currents.

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.

it depends on how much it could carry.

answer diabetes mellitus;