Ancient Egypt:
a) Was centered on the constant and predictable flow of the Nile River
b) is unique in that it had a continuous ruling class for over 2,000 years which allowed a constant slow steady improvement of the underclass
c) was first united under their famous Pharaoh Ramesses the II who conquered Nubia in 3100 BC
d) Is still a mystery in many ways as its form of writing is still not understood by historians