Which of the following events mostly involves hydrolysis reaction after the virus infects a eukaryotic cell? The virus degrades host RNA.
The virus synthesizes its own protein.
The virus assembles new particles of progeny.
The virus replicates its genetic material (DNA or RNA).

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.