Question

Which is not a vestigial organ in man?

• A. third molar
• B. nails
• C. segmental muscles of abdomen
• D. coccyx.

Answer 1

The Correct Option is B

The vestigial organs are the useless remnants of structures or organs which might have been large and functional in the ancestors. Segmental muscles in abdomen, coccyx, third molar (wisdom teeth) of human | are vestigial organs. Nail is not a vestigial organ of human.

Answer 2

Although vestigial organs were useful in our ancestors, they are no longer a necessary component of the body as a result of evolution.
The third eyelid is yet another name for the nictitating membrane. The plica semilunaris, a little fold of tissue inside the eye corner, is a piece of the nictitating membrane. It is well known that Plica semilunaris aids in eye motility and performs some lacrimal drainage functions. Unlike upper or lower eyelids, which move vertically across the eyeball, they move horizontally across the eyeball. Consequently, where this last vestige is located in the human eye
The modern man has advanced beyond his forebears. Since humans no longer live among animals, they do not need to climb trees. Humans, who have evolved to live in better surroundings and can walk on their legs, do not require tails like other mammals who rely on them for balance. Natural selection caused the usage of the tail to steadily decline, which resulted in non-functional organs. The tailbone was rendered useless and evolved into the coccyx, a united vertebra. A little tube called the vermiform appendix connects to the colon at its end. The appendix helped in the digestion of fibrous plant foods when people lived in the prehistoric age and were herbivores. However, human dietary supplements have altered the function of the appendix