An is a health care practitioner who designs, fits, and dispenses lenses for vision correction. a. audiologist b. optometrist c. ophthalmologist d. optician

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.

yes, because even though a theory has a  lot of evidence to support it, it is not always true

"it built up in the atmosphere"

i think thats it, idk, i tried looking for this exact q& a for grad. and idk if i got this question right or sorry if im wrong