Kwan really doesn't feel like riding the stationary bicycle today, but he doesn't want the people around him to think he is a slacker. if he decides to continue exercising, what concept might explain his actions?

He might be tired of one particular exercise, so he moves to a different one. It's fine, as long as he stays active.

The changes to agriculture in the united states since 1900 is that increased mechanization has increased food production, thereby increasing the need for labor. there has been an increased need for higher speeds of food production due the fact that the population in the united states continues to rise.