What is irrigation? Why is it important in Southwest Asia?

Oasis and underground river supplies also provide important  sources of water for farming.  Irrigation allows farmers to grow crops in areas that would normally be unsuitable for farming. 

vertical merger is the term used for the joining of two or more firms involved in different stages of producing the same good or services.

explanation:

cause you are attracted to the features of girls or if you are a boy you are attracted to the features of a boy.