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Our ancestors developed genes of fear for objects that were harmful to them and passed them down to us, so we are more 'prepared' to fear them over objects that were not harmful to them in the past.
The idea of preparedness also explains why we do not easily learn fears of modern things that are potentially dangerous, such as cars or knives.
In conclusion, the biological theory of phobias suggests that we have genes of fear for these objects that were passed down to us from our ancestors, causing us to be more 'prepared' to fear objects that were harmful to early humans, making us more likely to fear these objects over objects that were not harmful to them in the past.
This is why we are more likely to fear snakes more than rocks.
These are all common phobias. People and animals are innately predisposed to form associations between tastes and illness.