Q: Structures like the human tail bone and whale pelvis are called what?


Read this paragraph and choose the correct option from the provided answers:

Structures like the human tail bone and whale pelvis 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. It is a tiny remnant of a once-larger organ. In a distant ancestor, it was needed to digest food. It serves no purpose in humans today. Why do you think structures that are no longer used shrink in size? Why might a full-sized, unused structure reduce an organism’s fitness?.

 Choices:

- primordial structures

- parasitic structures

- adaptations

- vestigial structures


A:
vestigial structures