Psychologist is CORRECTLY paired with the organisms used in his best-known work is
C.Pavlov - cats
Explanation:
Pavlov is one of the most significant behavior psychologist whose work on classical and behavior conditioning has been revolutionary for he work of later psychologists who developed on this theory that is completely proven to work as he decided it did.
Pavlov performed his experiments of conditioning, his seminal work, over cats.
He hung a bell near the cat shelter and gave the cat food every time the bell rang and found out that the cat had learned to associate the bell with the food she was getting to eat.