[Solved] Which of the following is not a normal degenerative change of the male reproductive system? A) The testes become larger. B) The seminiferous tubules thicken. C) The prostate gland enlarges. D) Sclerotic changes occur in the local vasculature. Positive Reinforcer: A trigger that, when applied post-behavior, augments the likelihood of the recurrence of that behavior. Primary Reinforcer: A stimulus that satisfies a basic need or instinct, such as food, water, or warmth, and is inherently rewarding. Fixed-Ratio Schedule: A reinforcement strategy in operant conditioning where a response is rewarded only after a specified number of responses. Reinforcement: In behavioral psychology, a process by which the likelihood of a behavior's occurrence is increased through the addition of a stimulus following that behavior.