The Crusade changed Europe by "They increased warfare between the European states."
"<span>b. The development of stone tools" would be the best option from the list, since this was the major factor the made it a revival of the old stone age and changed the course of human history. </span>
Neutrons have no charge an thus could not be manipulated in electric or magnetic fields.
The war between Germany and the allies formally ended with the Treaty of Versailles, which demanded the unconditional surrender of Germany and imposed harsh reparations on them that were almost impossible to pay back.
for fealty it's fealthiness.
and for gambit it's gambetto.