Evolution of language

What good is language?

Communication
Thought
"Grooming"
Learning and differences
Speaking and hearing
Structure: grammar
Structure: phonology
Speech acts: reference, assertion, request, etc.
"Obligatory" morphology
Arbitrariness

How could language have evolved?

How could a relatively small difference in behavior (resulting from genetic or cultural variation) lead to reproductive advantage for the population with the language-like behavior?

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