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In regard to the production of speech sounds, all typical humans are physiologically alike. It has been shown repeatedly that children learn the language of those who bring them up from infancy. These are often the biological parents, but one’s first language is acquired from environment and learning, not from physiological inheritance. Adopted infants, whatever their physical characteristics and whatever the language of their biological parents, acquire the language of the adoptive parents. Different shapes of lips, throat, and other parts of the vocal tract have an effect on voice quality; this is part of the individuality of each person’s ...(100 of 25352 words)