Which of these events occurred during the Ghana Empire? Timbuktu was developed into a center of learning.
Islam was introduced into the West African region.
Moroccan invaders conquered the empire.
A large amount of technology was developed.

what the first or next guy says

i think it was because of how protected egyptian civilization was was which allowed them to evolve without much outside influence.

“a committee reviews the bill and marks it up to make it more viable and to reflect interests 

most people now work in jobs where they do one  kind  of work; they are carpenters, bankers, cooks, mechanics, and so forth. likewise, most  businesses produce  only certainkinds  of  goods  or  services, such as cars, tacos, or gardening  services. this feature of  production  is known as specialization.