C. is commonly found in only tropical climates. endemic means a a disease (in most uses) <span> that is regularly found among particular people or in a certain area.</span>
The expanding of the muslim Empire in the years following the Prophet Muhammad's death led to the creation of the caliphates, occupying a vast geographical area and conversion to Islam was boosted by missionary activities particularly those of Imams, who easily intermingled with local populace to propagate the religious teachings.
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A common theory is that the Aryans originated in the Russian plains and possibly migrated to Europe and in Mesopotamia. There is also a belief that they arose in Europe and migrated eastward. According to some theorists Aryans founded the ancient civilizations of Mesopotamia and were thus the first civilized people of the world.
