Which of the following is not a vestigial organ:

🧠 Explanation:

Eyelids are not vestigial organs, as they serve essential functions like protecting the eyes and maintaining moisture, unlike vestigial structures such as the appendix, which have lost significant functionality. Eyelids blink to shield eyes from debris and distribute tears, crucial for vision health. Understanding vestigial organs is key in biology, illustrating evolutionary changes where structures become obsolete. Eyelids’ active role contrasts with vestigial organs, making this distinction important in studies of human anatomy and evolutionary biology, clarifying how organs adapt or persist over time.