Why did every single one of my answers just get deleted- Who was the first African American to earn a doctoral degree from Harvard University?(1 point)

A.
W. E.B. Du Bois

B.
Langston Hughes

C.
Louis Armstrong

D.
Josephine Baker

It was A

Explanation:

answer; the answer to the first question is (king james ii was replaced by his daughter mary and her dutch husband william of orange;

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.