ANATOMY

Detailed explanation-1: -These are known as vestigial structures: features that had a necessary function at one time for an organism’s ancestors, but are nowhere near as important for modern species. Wings on flightless birds are just one example.

Detailed explanation-2: -These unused structures without function are called vestigial structures. Other examples of vestigial structures are wings (which may have other functions) on flightless birds like the ostrich, leaves on some cacti, traces of pelvic bones in whales, and the sightless eyes of cave animals.

Detailed explanation-3: -Vestigial organs are those that have ceased their function. In certain flightless birds like the Kiwi and Ostrich, the wings are vestigial.

Detailed explanation-4: -A vestigial structure is a biological structure that has lost a major ancestral function and is usually drastically reduced in size. Well-known examples include the eyes of blind cave fishes and blind cave salamanders, and the diminutive wings of kiwis and emus.

Detailed explanation-5: -Sinuses. Human cheekbones hold the maxillary sinuses. Appendix. It is one of the most commonly known vestigial organs. Coccyx. Wisdom Tooth. External Ear. Nictitating Membrane. Tonsils. More to Explore: