Explain why the Xia dynasty is usually not considered to be the first dynasty in ancient Chinese history.

The Xia Dynasty is so old that it is still not certain whether or not the dynasty actually existed. It is believed to have been started by Yu the Great around 2070 B.C., but as a result of how early this is, it is difficult to determine whether it existed.

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acid rain is the answer

the arab empire adopted the muslim religion as their main belief. arabs would influence the people from the territories they invaded towards islam (the muslim belief).

nevertheless, throughout the history of the arab empire, rulers brought intellectual individuals from other religions to their centers of learning. these other foreigners included jews, christians, greeks, persians, and indians.   these resulted in the adoption of important knowledge developed by these cultures by the arabic empire. for example, the works of aristotle were translated from greek to arab and indian scientists brought the numerical concept of "zero" to the arabs.

nowadays, 93% of the arab population is muslim, which at the same time is subdivided in sects including the sunni, zaini, alawi, shia. the remaining 7% is composed mainly of christians.