European leaders responded to Islamic expansion in a very violent way. Following the initial incursions of the Islamic forces in those years, the European leaders decided it was time to take up arms and fight them in their own lands - what followed were the Crusades.
Explanation:
A. One is because school thinks wearing hats in a class IA a sign of disrespect to teachers and other students.
B. Another reason is because wearing hats could be blocking the view of other students sitting behind the wearer. In other words, it could deprive some students from learning or participating in class.
Have in common with what?
