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John Garcia's research on taste aversion with rats helped establish that there are adaptive biological constraints on learning. In one study, he shocked one group of rats after they drank flavored water. A second group's flavored water made them sick.

How did the rats respond?


Both groups avoided the water.


Only the shocked rats avoided the water.


Only the rats that experienced the nausea avoided the water.


Neither group avoided the water.


At first, neither group avoided the water, but after more pairings, both groups did.

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