How did John Garcia demonstrate biological preparedness?

Question

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John Garcia demonstrated biological preparedness through his work with rats, showing that they could be conditioned to develop aversions to tastes associated with sickness, a finding that was significant because it challenged the prevailing notions of conditioning at the time. This work illustrated that animals are biologically prepared to make certain associations more easily than others, particularly those that have survival value.

How Did John Garcia Demonstrate Biological Preparedness