Praise be to Allah. I think
Answer: Question 1 : 400 years. Question 2 : Its best know for a large number of pyramids. Question 3 : I'm not sure, sorry. Question 4 : Physicians, dentists, lawyers. Question 5 : End of a dynasty, Fragmented rule, & Despair and collapse.
Explanation:
You put your questions in the wrong category, love. You need to move them to physics.
I believe the answer would be D because it is not however the most significant concept in economics