How do farmers in the Andes Mountains of South America modify their physical environment? A. Build desalinization plants

B. Construct irrigation systems

C. Use terraced farms

D. Build canals

Which of the following was not a result of the attacks of 9/11or the war on terror? a. tightening security at airports b. an increase in public displays of patriotism c. a growth in the number of conspiracy theories about the government d. an increase in the number of hijackings worldwide