While excavating an area in the desert, a scientist discovers the fossils of very large tress and ferns. what might the scientists conclude about biomes in this area?

ur answer is e & d

explanation:

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.