Pls help on biology images shown below

frogs. the lower the ph the higher the acid content. frogs have the highest tolerance in this scenario.

50% lit on the left side

c should be the answer

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.