Question

boys have a deep voice why?​

Answer 1

Answer:

Before a boy reaches puberty, his larynx is pretty small and his vocal cords are kind of small and thin. That's why his voice is higher than an adult's. But as he goes through puberty, the larynx gets bigger and the vocal cords lengthen and thicken, so his voice gets deeper.

Answer 2

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ᴛʜᴇ ʟᴀʀʏɴx ɢᴇᴛs ʙɪɢɢᴇʀ ᴀɴᴅ ᴛʜᴇ ᴠᴏᴄᴀʟ ᴄᴏʀᴅs ʟᴇɴɢᴛʜᴇɴ ᴀɴᴅ ᴛʜɪᴄᴋᴇɴ, sᴏ ʜɪs ᴠᴏɪᴄᴇ ɢᴇᴛs ᴅᴇᴇᴘᴇʀ.