How does pollution contribute to global warming? It changes the direction of major currents.
It forms a barrier that keeps in the sun's heat.
O It makes it harder for the sun's rays to reach Earth
O It makes it more difficult for sea life to survive in the ocean.

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.

answer; cnidarians;

is it multiple choice?