"or might it suffice him, that every wholesome growth should be converted into something deleterious and malignant at his touch? did the sun, which shone so brightly everywhere else, really fall upon him? or was there, as it is rather seemed, a circle of omnious shadows moving along with his deformity, whichever way he turned himself? "

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.

answer; face validity;

i believe the answer is: true

our brain need to reach a certain level of development   before it could interpret and understood sound with high difficulties. to proof this, we just need to pay attention in musical preference between children and adults. it is far less likely that children would enjoy things such as orchestra or rock band as much as adults due to the difference in this ability.