Three differences between spring and fall

in Fall, the leaves fall, animals hunts for food to prepare for hibernation in winter, gets colder

In spring, leaves grow, flowers blossom and animals come out of hibernation, becomes warmer

Explanation:

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.