What is the most basic architectural technique for spanning space?

What Norman leader won a military victory at the Battle of Hastings that is celebrated in the Bayeux Tapestry?

a. Constantine b. William the Conqueror c. Charlemagne d. Charles Martel

The __________ appeared as a transportation device in Sumer around 3000 B.C.E

A) camel B) rickshaw C) horse D) wheel E) elephant