LIFE SCIENCE

Detailed explanation-1: -Structures like the human tail bone are called vestigial structures. Evolution has reduced their size because the structures are no longer used. The human appendix is another example of a vestigial structure.

Detailed explanation-2: -Key Points. Structures that have no apparent function and appear to be residual parts from a past ancestor are called vestigial structures. Examples of vestigial structures include the human appendix, the pelvic bone of a snake, and the wings of flightless birds.

Detailed explanation-3: -Appendix. The appendix is perhaps the most widely known vestigial organ in the human body of today. If you’ve never seen one, the appendix is a small, pouch-like tube of tissue that juts off the large intestine where the small and large intestines connect.

Detailed explanation-4: -Vestigial structures are various cells, tissues, and organs in a body which no longer serve a function. A vestigial structure can arise due to a mutation in the genome.