To be categorized in the feature stimulus class labeled 'duck', which feature is required?

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Multiple Choice

To be categorized in the feature stimulus class labeled 'duck', which feature is required?

Explanation:
Membership in a feature stimulus class hinges on a physical trait that all members share. For the duck class, the feature that consistently characterizes ducks is webbed feet, an adaptation for swimming. Other features like loud quacking, white plumage, or green color are not universal to all ducks, so they don’t define class membership. Therefore, webbed feet is the required feature for being categorized as a duck.

Membership in a feature stimulus class hinges on a physical trait that all members share. For the duck class, the feature that consistently characterizes ducks is webbed feet, an adaptation for swimming. Other features like loud quacking, white plumage, or green color are not universal to all ducks, so they don’t define class membership. Therefore, webbed feet is the required feature for being categorized as a duck.

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