Which of the following was not an achievement of the islamic empire? astrolabe justinian code mosques algebra

a because i tried to vote with just my college id and the answer was no

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.