Why is it so difficult to conceal nervousness? because we get so paranoid that everyone can tell because the hormone adrenaline causes a physical response because nervous people are very bad at controlling their body language because it is similar to deception?

It is difficult to conceal nervousness because the hormone adrenaline causes a physical response.

 Human body's reaction to being nervous can flare up in very uncomfortable physiological ways. Sympoms include: we begin to sweat, our cheeks flush, and some of us even develop a nervous tic--a bouncing knee, twitchy foot, nail biting, blinking too rapidly, or speaking too quickly.

the answer is true .

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.