Your roommate celine is normally an active person, but over the last two weeks she has remained in the apartment for several days. she won't talk to her friends when they call, and she seems to have no appetite. celine is most likely suffering from

Celine is most likely suffering from  "clinical depression".

Depression ranges in seriousness from mild, brief scenes of pity to serious, relentless despondency. Clinical depression is the more-extreme type of sorrow, otherwise called significant misery or real depressive issue. It isn't the same as sorrow caused by a misfortune, for example, the demise of a friend or family member, or a restorative condition, for example, a thyroid issue.  

two jet streams that directly affect the formation of weather in the continental part are a polar jet and a subtropical jet. they are responsible for the transportation of weather systems, which directly affect people. the polar front is the boundary between cold air from the north pole and warmer equatorial air. both the polar jet and the subtropical jet blow from the west to the east, and follow the boundary between cold and warm air.

the strongest jet streams are polar jets, while subtropical jets are somewhat weaker.

the right answer is c. the polar jet stream is generaly stronger than the subtropical jet stream.