Answer:
d. Skinner box
Explanation:
Skinner box provides an experimental condition that is used for examining natural flow of the behavior. It is also known with the other name as Operant conditioning chamber. It is a small chamber in which the animals for research are kept. Within the chamber there is a lever or key that the organisms under research can operate in order to get food or water in the chamber. An electronic equipment is connected to the chamber which records the activities of animals on keys or lever.
Secondary succession
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