State one reason for rapid population growth in megacities. explain one reason why this growth is concentrated at the rural-urban fringe.

A. There's more job opportunities in megacities. You can find work fairly simple by moving to a large city; there's factory jobs, office jobs, etc. 
B. Offices are moving away from the city, housing developments are cheaper away from the city, and transport changes.

Answer islamic scholars made advancements in technology, literature, philosophy, mathematics, astronomy, and the arts during this time period;

Developed countries will see a decrease in natural resources, because their population will decrease.