The energy currency used by cells is
atp
adp
amp
adenosine

ATP is a correct answer.

Explanation:

The energy currency used by cells is ATP

ATP adenosine triphosphate is called as energy currency.

ATP molecule is present in the living cells.

ATP is called energy currency because ATP is a energy molecule that living cells need to carry out any function.

ATP function as the battery inside the cells and play a major role in nucleic acids synthesis.

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.