Secondary reinforcers are learned or conditioned. An example of a secondary reinforcer is grades or money. Secondary reinforcers are learned and are reinforced by the continual use of the reinforcer. Primary reinforcers are biological and include food, drink, and pleasurable activities.
The type of investors are oil investors, gold, and energy
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characteristics of a certain nation or racial group
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has a monocentric focus that limits the inclusion of urban sprawl
Explanations the one i picked