How do scientists try to eliminate being misled by incorrect or fake results?
a. revision of experiments
b. repetition of experiments
c. resolution of experiments
d. replication of experiments

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.

its probably to later but whats the question