ANATOMY

Detailed explanation-1: -In humans, the vermiform appendix is sometimes called a vestigial structure as it has lost much of its ancestral digestive function.

Detailed explanation-2: -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: -In humans, the appendix is a good example of a vestigial organ.

Detailed explanation-4: -Thus, the correct answer is ‘Appendix.

Detailed explanation-5: -Vestigial structures are body parts that have lost their use through evolution. Homologous structures are structures that have a common function and suggest common ancestry. Similar embryos suggest that these animals are related and have common ancestors.