In an experiment, one group of men were asked by an attractive woman to complete a short questionnaire immediately after they had crossed a swaying footbridge suspended 230 feet above the Capilano River. This experiment was designed to study the factors that contribute to:

A. the bystander effect.
B. social facilitation.
C. the mere exposure effect.
D. passionate love.
E. the foot-in-the-door phenomenon.

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.