The simplest organisms in which operant conditioning has been documented are ______.

a.  Single-celled

The simplest organisms in which operant conditioning has been documented are single-celled.

Explanation:


Previous research shows that when ganglia are removed and retained in culture, then emits induced electrical activity, which is an analog behavior due to dopamine application that acts as an analog reinforcement. Therefore, the single-cell most likely remains active in future after conditioning, which implies that the simplest organisms to display some form of operant conditioning are single-celled organisms. 

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