The presence of a competitive fringe ________ a dominant firm's markup.
A) increases
B) does not affect
C) exactly doubles
D) decreases
D) decreases
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________ is the greatest threat to endangered primates
A. Uniformitarianism B. Directional selection C. Intragroup predation D. Mutation E. Deforestation
Around the world, an estimated __________ children are forced to serve as soldiers in armed conflicts
a. 50,000 b. 200,000 c. 300,000 d. 500,000
Which of the following is an example of independent invention, the process by which people in different societies have innovated and changed in similar but independent ways?
A. culture B. language C. globalization D. agriculture E. acculturation
Natural selection proceeds ___________________
a. never b. only when individuals within a population vary c. when Darwin says it does d. always very rapidly