Final answer:
Garcia and Koelling's studies of taste aversion in rats demonstrated that classical conditioning is influenced by biological preparedness.
Step-by-step explanation:
In Garcia and Koelling's studies of taste aversion in rats, they demonstrated that classical conditioning is influenced by biological preparedness. They showed that rats were more likely to develop a taste aversion to a specific flavor when it was paired with illness, indicating an innate predisposition to avoid potentially harmful foods. This finding contributes to our understanding of how organisms learn to avoid stimuli that pose real dangers to health and welfare.