55.Juan, who is 16, is very motivated to make the Olympic swim team. He practices several hours a day and sets very high, but achievable goals in his competitive times for each event. The more improvement he makes, the harder he practices. His goal and behavior best illustrate the concept of

achievement motivation.

Explanation:

Achievement motivation typically refers to the motivation if an individual to engaging in achievement. Achievement motivation is the need of a person to meet realistic goals, and be able to experience a sense of accomplishment.

Based on the information given, since we are informed that the more improvement Juan makes, the harder he practices. Therefore, the goal and the behavior by Juan illustrates achievement motivation.

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.