what are factor endowments

I need your help for writing essay (5 pages not including the cover page and references page) about factory endowment theory.

There will be two countries and for for each country, will discuss:

-What is the impact of resource endowments on comparative advantage?

-Is the factor-endowment theory a good predictor of trade patterns?

-What additional trade theories can be applied? 

Also please note that:

-APA style should be used

-Font will be: Times roman 12, and 1.5 space should be between lines

-At least three scholarly, peer-reviewed journal articles will be used as references.