The Adam's apple is the partial growth of the voice box or larynx. Larynx is made up of 9 cartilages. During adolescence the thyroid cartilage(largest cartilage) increase/ grow with the larynx(voice box).
Adam's apple is basically a feature of males because in males the size of voice box(larynx) tends to increase during puberty. And this change in the size of voice box is controlled by male hormone(testosterone). However some women's also have an Adam's apple.
i. To protect the front part of the larynx.
ii. It makes the voice deep.
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