Microorganisms of a family of fungi, called the Lepiotaceae, live with leaf-cutter ants. The ants collect fresh leaves to grow the fungus, and then they feed the fungus to their larvae. Another type of microorganism, a fungus of the Ophiocordyceps family, also
has a relationship with a type of ant. The spores of the fungus attaches to carpenter ants in order to complete its life cycle. The
spores spread into the ant's body and causes behavioral changes in the ant, eventually causing the ant's death.
What does this information demonstrate?

Between the Lepiotaceael and the eaf-cutter ants, there is what we call mutualism. They both depend on each other buh no harm is done.

But between Ophiocordyceps family and the carpenter ants, it is called parasitic relationship. The Ophiocordyceps harms the carpenter ants.

Explanation:

Hope it helps.

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.