How can exposure to air pollution be reduced indoors and outdoors?

Ireally need to know this answer asap

Which one of the following causes people to go through a cycle of losing weight, gaining it back, then lose it again

Which statement supports the principle ideas of jean piaget's philosophy? adults should not interact with teachers. children are best educated through standardized training. adults do not think better than children, but they think differently. children should not form hypotheses until they are certain their findings will be correct.