According to the theorist Robin Dunbar, what replaced physical grooming in humans?

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Robin Dunbar proposed that as human societies grew larger and more complex, physical grooming became impractical for maintaining social bonds. Vocal grooming, or the use of language and vocalizations to build and maintain social connections, emerged as a substitute. This theory suggests that language evolved as a form of social grooming to help maintain larger social groups.

According to the Theorist Robin Dunbar, What Replaced Physical Grooming