Why did the abbasid caliphate decline?
a. the turks took over baghdad; then the mongols invaded.
b. the seljuk turks invaded spain from north africa.
c. timur the lame swept into spain and defeated the abbasids.
d. the mongols put a figurehead on the throne; then the turks invaded.

he 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:

d) a week

because the land run of 1889, although not without precedent in the history of the west, further, their men were aboard the first trains, ready to jump off and begin staking their claims. oklahoma city, edmond, and guthrie were all so affected.