Which of the diagrams in the figure represents a ligand-gated channel? 
Definitions:
Flavor Aversion
The learned avoidance of a particular flavor or food due to a negative experience, such as illness, associated with that specific taste.
Long-Delay Learning
The association of a flavor with an illness or positive nutritional consequences that occurred even several hours after the flavor was consumed.
Species-Specific Defense
The predetermined, instinctive behaviors exhibited by animals of a particular species when threatened, reflecting survival mechanisms evolved over time.
Reactions
Responses of an organism to internal or external stimuli.
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