Answer:
The correct answer is C. The United States suffered an economic downturn starting in 2009.
Explanation: Taking the test now!! Answer is on Quizlett also.
The primary responsibility of air traffic controllers is the separation of aircraft. They control traffic in and around airports and in the terminal and en route airspace in between. Controllers speak directly with pilots, notifying them of traffic or weather in there vicinity.
Answer: The United Nations was created to promote international cooperation.
Labor intensive means that humans did the most of the work during the production process ( they handcrafted each products and use slave labors to increase the production)
Energy intensive means that machines did most of the work during the production process. This process started to spread after the early development of industrial revolution.