What ways might rivers have been important to ewrly human settlements? the answer to this question is :

ANSWER: //
For this reason, farmers often settled near rivers. A river's natural flooding could help irrigate their farms. Farmers could also dig canals or trenches to direct river water to their crops. For example, farmers in Mesopotamia dug canals for this purpose.

I'm not sure why this is a question, and the answers seem right to me. Rivers also help because there are fish in the water and they used fish for food.

1. it was caused by feudalism

2. charlemagne used christianity as a major cornerstone for his rule. cloisters were built all over the empire to act as centers for the (re)population of the vast european wilderness.

3. the europeans feared the next raid every time chetak

i'm not so sure about #6. but i hope i you with the first 3.