How did growing sectional differences result in southern secession?

With the clear differences between northern and southern areas in terms of economy and politics, immigrants going to northern areas, and with the fear that the southern interests, including slavery, in congress would be weakened caused the southern people (mainly represented by whites) to cease from the Union.

d. the polar jet stream   lies between the polar easterlies and trade winds should be your answer

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.