For an entire species to survive, it must allow for new generations to maintain the population. This is the challenge of
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Explanation:

In order for species to survive over generations, they will have to adapt. Adaptation is a form of evolution.

I hope this 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.