What was the main cause of the turmoil that led up to the crusades?

Explanation:

what the main cause of the turmoil that led up to the crusades is "The Crusades were a series of military campaigns organised by Christian powers in order to retake Jerusalem and the Holy Land back from Muslim control. There would be eight officially sanctioned crusades between 1095 CE and 1270 CE and many more unofficial ones. Each campaign met with varying successes and failures but, ultimately, the wider objective of keeping Jerusalem and the Holy Land in Christian hands failed. Nevertheless, the appeal of the crusading ideal continued right up to the 16th century CE, and the purpose of this article is to consider what were the motivating factors for crusaders, from the Pope to the humblest warrior, especially for the very first campaign which established a model to be followed thereafter."

I hope this helped you

food chain i would say only because there is competition on getting food and survival