It is easier to carry out a controlled experiment in the field than it is in the laboratory. True

False

true

Explanation:

because if you did it in a lab and something goes wrong then being outside is more helpful in that situation

c: warm water flows from the western tropical pacific toward south america. that should be the right answer! hope it .

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.