Right write an essay on the characteristics of respiratory surface give five points

answer; ///i believe the correct answer is (aids) acquired immune deficiency syndrome;

this is a good question! i'll do some research and come back when i have the answer!

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.