Lincoln Elementary School has a policy that prohibits students from running in the halls. Ms. Davis, the hall monitor, waits by the cafeteria doors every morning from 8:00-8:30, watching for “runners.” The schedule of reinforcement being used by the school—and Ms. Davis—to stop students from running is a.
fixed interval.
b.
fixed ratio.
c.
variable interval.
d.
variable ratio.

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A. describe the model of urban structure most often observed in mega-cities in developing countries. explain how this model differs from common urban structures in north america. b. describe at least two factors leading to the growth of mega-cities in developing or least-developed countries. c. identify and explain two factors that led to the formation of squatter settlements in mega-cities in developing countries.

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