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A primary source is one that is written by someone who experienced the event firsthand. Anne Frank's diary is an example of a primary source. She was the first (primary) person who experienced what happened on that hierarchy.
A secondary source is one that is written about a primary source. It comes second on the hierarchy of receiving historical information because it has to be based on a primary source, which gives the actual information. A history documentary is an example of a secondary source.
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Answer:
He brough Islam to Persian culture plus many cultures adapted to Islam (full explaination below)
Explanation:
Anatolia was not empty until the Seljuk Turks captured it. It was, in fact, part of the Byzantine Empire, the main Christian power east of Rome. When the Seljuk Turks moved in, they brought in the Islamic religion as well as the Persian culture, which the Turks had largely adopted after becoming part of the Muslim Empire.
This made it difficult for people to cross from one side of the peninsula to the other.