1) The document summarizes research on classical conditioning and social learning theory as they relate to phobias. It discusses studies showing how phobias can develop from conditioning, like Little Albert's fear of rats, and through social learning by observing others, as in monkeys learning snake fears. 2) Preparedness theory proposes that humans more easily learn associations between stimuli that were threatening in our evolutionary past, like snakes. We are less likely to fear stimuli like clothing that held no evolutionary risk. 3) Research also found people tend to fear animals perceived as ugly, slimy, fast-moving or acting suddenly, supporting both nature and nurture influences in phobia development.