Simplify: 
÷ 
Definitions:
Grades
Marks or scores assigned to students' work to indicate the quality of their performance, typically on a scale from A to F.
Operant Conditioning
The act of modifying how strongly a behavior is exhibited by the application of positive or negative stimuli.
Lever Pressing
Lever Pressing is an experimental procedure in behaviorism where an animal is trained to press a lever to receive a reward.
Rats
Small rodent animals often used in scientific research due to their physiological similarity to humans and their manageable size.
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