Most shia Muslims are of northern semitic extraction, while Sunni Muslims in the Arabian peninsula are largerly descended from Ishmael, as is the general "claim." Most historians hold Biblical patriarchs, including the patriarch of the Arabs, to be myths, despite genetic evidence of relative genetic homoge-whatever among the Arabs. The general claim is that the biblical Abraham did not exist, and yet throughout the eastern hemisphere a Y chromosomal genetic marker was found that can be traced back to a single man. The identity of that man however, is a mystery.
Some theories hold it was Genghis Khan, however, the problem with that theory is that he only had a small handfull of concubines, relatively small for a powerful Mongol Chieftain-turned-emperor.
Although this is not written anywhere, and violating wiki answers rules here this is a personal opinion, highly likely that man was Marco Polo believe it or not, who most prolifically fathered children across the eastern hemisphere.
Even in Muslim era Persia, many of the isolated tribes still followed old customs regarding sexual practices, and the whole idea of virginity was alien to them. Then there is also the issue of traveller hospitality; if a traveler wished for a woman, hospitality rules beyond the Arabian peninsula, and in parts of Persia, said that you had to give them a woman, usually one of your daughters. Far as pregnancy issues, in those times people were not racist like they are now, nor were children seen as a burden but a blessing; if a kid resulted, if it was a boy, it was a helping hand on the fields, or in battle, if it was a girl hey, she was born pretty she could be married off to a wealthy family.
The appearance of blue eyes, is frequent, along the area of the silk route; its highly possible, those are descendants of Marco Polo. Marco Polo was 15 I believe when he left Italy, and well into the silk road, he'd have been a horny teenager. What I am suggesting, is that Marco Polo impregnated men's daughters, and possibly wives, from Iran, throughout northern India, and parts of China, hence the reason that particular genetic marker is found all over the place. This COULD be confirmed, if any descendants of Marco Polo were tested today, and see if their genes match those of those people.
Again many parts of the silk road had vague sexual morals, but strict hospitality rules dictating you had to give a traveler a woman if they needed one, being a teenager again the likelihood is very high, Marco Polo was spoiled sexually, from western Persia, all the way to China.
Of course that's just an opinion; a scientist has yet to test this.
Disease and lack of food.
decline of tughlaq dynasty
Abbasid caliphate -- Baghdad Ummayyad Caliphate- Cordoba
a natural disaster from a volcanic eruption
greed for land and money
A Caliphate is an outmoded, tyrannical form of government that only benefits the bullies of society.
Mutual differences after the assaisination of the Third Rightful Caliph Hazrat Usman (RAU).
The Abbasids fell to an ambush of the mongols; while Umayyads fell to economics.
being a nob
What were the causes and consequences of the decline of the Mughal empire
Fewer people buying.
Disease and lack of food.
i dont know you ansewer it
Smaller natural habitat, more human encroachment, and less food are the three main causes for the decline of the frog species.
Abbasid Caliphate.
Rashidun Caliphate was created in 632.
Weeds, Pests, and Diseases.