From where do many of the United States's key ideas for government come? O A. ancient Greece and Rome
O B. the Constitution
O C. the judicial branch
O D. the U. S. Congress

A. ancient Greece and Rome

Explanation:

The constitution, judicial branch, and congress are all currently part of of the US government, not a source for its key ideas.  

he was able to speed up production of the processing of seeds

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.