In addition to replacing the president if necessary, it's the duty of the vice president to a. review laws before the president signs them. b. preside over the senate. c. serve as speaker of the house. d. serve as liaison to the judicial branch.

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explanation:

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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.