When a natural system gets locked into a positive feedback loop, it can reach an ecological tipping point. True

False

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.

occluded front i think

because it travels in smaller waves then all other colors, causing it to be the most visible color