Read the article titled "comparative advantage. " explain what comparative advantage is and how it relates to opportunity cost. How do these principles explain why americans have exported customer service operations to india?

Certain gases in air are important natural resources that are used in welding. two of these gases are a. oxygen and argon b. hydrogen and fluorine c. chlorine and sulfur dioxide d. nitrogen and carbon dioxide

El año pasado fuimos a guatemala y nos en el hotel amanecer.

How do refracting telescopes magnify a far away image? a. by directing light beams to meet at a focal point b. by absorbing light beams’ wavelengths c. by forcing light beams to change direction d. by measuring light beams’ velocity