Which characteristic describes the troposphere? A)contains the ozone layer
B)has the highest air pressure
C)spans 12-50 km above Earth
D)is a good place for planes to fly

It is B)has the highest air pressure

Explanation:

c, a, and d is talking about the straosphere same as a plus plane usally flies above the troposphere cause the altituide is more calmer.

multiplying and dividing the two decimals and the eqations by the same number of the overalls