Why are physical fitness attitudes important?
a. they are able to change our moods.
b. they reflect our internal ethics.
c. they show others how we feel.
d. they influence our activity levels.

d. They influence our activity levels is the correct answer.

Explanation:

the mongolian invasion of china and central asia resulted in a disruption of the silk road as the chinese garrisons lost support from the chinese kingdoms which fell under the mongols. however, as the mongols established a formal dynasty in china, the successors of genghis khan restored the garrisons along the silk road allowing the safe travel caravans again.