Question

question:
which of the following is/are an example of a homologous structure?

answer options:
select one of four
fish fin wisdom teeth
vermiform appendix eyeballs

feedback:
incorrect. which is shared by all descendants of a common ancestor? try again.

Explanation:

Homologous structures are those inherited from a common ancestor, showing structural similarity but maybe different functions. Wisdom teeth, vermiform appendix are vestigial (not homologous in the sense of shared by all descendants of a common ancestor for function), fish fin - but eyeballs: Vertebrates (like mammals, birds, reptiles, fish) share a common ancestor with eyes (eyeballs) as a homologous structure (same origin, adapted differently). Wait, re - evaluating: The key is "shared by all descendants of a common ancestor". Among the options, eyeballs (eyes) are a homologous structure across vertebrates (from a common ancestor with a basic eye structure, evolved into different forms but same origin). Fish fin: not all descendants of a common ancestor (e.g., tetrapods don't have fins like fish). Wisdom teeth and vermiform appendix are vestigial in humans, not shared by all descendants of a common ancestor in the same functional way. So the correct answer should be Eyeballs.

Answer:

Eyeballs