Essential Question (DNA structure): Identify the structure of the DNA molecule including important vocabulary terms for its monomers, polymers, and how the molecule contains a “code” of information.

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.