1. How are theories useful to policymaker? Do policy makers use more than one theory to understand the world? 2. IGO's are important actors for liberals, but in what ways are they constrained and limited in world politics?

3. What are the main differences between Realism and Liberalism in the study of International Relations?

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.

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when you sing louad enough the vibration of you voice is able to shatter glass so yes vibration is your answer

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