Which of the following is the best example of homeostasis? * O Heart rate increases when a person exercises
O The chest cavity expands when the diaphragm contracts,
O The biceps muscle relaxes when the triceps muscle contracts,
O Digestive enzymes are secreted when food enters the stomach.

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.