Which one of the following is a vestigial organ? (1) Eye-brow (2) Collar-bone (3) Wisdom-teeth (4) Nails

Which one of the following is a vestigial organ? (1) Eye-brow (2) Collar-bone (3) Wisdom-teeth (4) Nails
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(3) Wisdom-teeth Explanation: Wisdom teeth are vestigial third molars that human ancestors used to help in grinding down plant tissue. The common postulation is that the skulls of human ancestors had larger jaws with more teeth, which were possibly used to help chew down foliage to compensate for a lack of ability to efficiently digest the cellulose that makes up a. plant cell wall. As human diets changed, smaller jaws were naturally selected, yet the third molars, or "wisdom teeth," still commonly develop in human mouths.
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