Okay? I may be slow right now or something, what is the question here?
Because it was worthless and had no value to it.
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: