Erica is working in the lab. she wants to remove the fine dust particles suspended in a sample of oil. which method is she most likely to use? a: reverse osmosis b: osmosis c: filtration d: dilution

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.