On a very hot day, a tennis player produces large amounts of sweat. In response, she drinks water and her kidneys reduce urine output

trachea, alveoli, lung capillaries, arteries

c. heat from the poles back down towards the equator.

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.