Multiple choice

Why do boys have deep voice whereas girls have high pitched voice?

  1. The voice box or larynx grow bigger in boys than girls.

  2. The boys are physically stronger than girls.

  3. The vibration made by vocal cord is more in boys.

  4. All of these together affect the sound.
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A Correct answer
Explanation

 Yes, the larynx gets bigger and the vocal cords lengthen and thicken, so boys'  voice gets deeper. Along with the larynx, the vocal cords grow significantly longer and become thicker.

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