A group of researchers discovered a tribe of people in a South American jungle. The tribe had never been exposed to the outside world before. The researchers initially greeted the tribe with a smile. They believe that some emotional expressions have the same meaning for everyone. In this case, to which belief do these researchers subscribe?

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.

answer; motor learning;

answer; make a no-nonsense accusation of the other;

answer; explanatory study;