How did the united states respond to russia's invasion of afghanistan? it boycotted the 1984 winter olympics. it broke off all diplomatic relations. it convinced the united nations to get involved. it boycotted the 1980 summer olympics.

tearing down the berlin wall.

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explanation:

answer: the risk-return relationship. generally, the higher the potential return of an investment, the higher the risk. there is no guarantee that you will actually get a higher return by accepting more risk. diversification enables you to reduce the risk of your portfolio without sacrificing potential returns.

explanation:

hi, according to my research the answer to the first question would be false. al tabari was the author of the first medical encyclopedia & he was a persian scholar not arab