If two brown eyed people had a blue eyed child, what is the genotype of the parents? ​

the blue eyes people in the family long before them could have skipped generations

Explanation:

Because the two genes depend on each other, it is possible for someone to actually be a carrier of a dominant trait like brown eyes. And if two blue eyed parents are carriers, then they can have a brown eyed child.

Explanation:

when it is at an intermediate population density

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.