The gas that has increased significantly because of human activity is:
A. carbon dioxide
B. methane
C. dihydrogen oxide
D. nitrous oxide
A. carbon dioxide
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If a competitive market is producing at the efficient quantity, ________.
A) a deadweight loss exists B) the quantity produced exceeds the equilibrium quantity C) total surplus is minimized D) total surplus is maximized
The Upper Paleolithic is often defined in terms of:
A. Oldowan tools C. the hand ax D. the bow and arrow
Worldwide, an estimated 5.7 million children are engaged in __________
a. forced or bonded labor b. factory production c. unpaid productive labor d. household maintenance
All of the following are true about race except: a. Race exists as a social and political category that promotes inequality in some societies. b. Biological evidence demonstrates unequivocally that separate human races do not exist. c. Scientists disagree on the number of biological human races that exist
d. Gene flow throughout evolutionary history has maintained humans as a single species.