The fact that most infants,regardless of their culture,begin to coo and babble at similar ages adds further evidence that

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The fact that most infants, regardless of their culture, begin to coo and babble at similar ages suggests that biological factors (such as brain development and physical capabilities of the vocal cords) play a role in the onset of these behaviors. This indicates that the timing of vocal development is not solely dependent on environmental factors or nurture.

The Fact That Most Infants,regardless of Their Culture,begin to Coo