Question

question 5 of 10
what is a vestigial structure?
a. a structure that contains isotopes
b. a structure that is only in index fossils
c. a structure with similar shape but a different use
d. a structure that has no use in the organism

Explanation:

A vestigial structure is a remnant of a structure that had a function in an early ancestor but has lost most or all of its function in the organism. It is not related to containing isotopes (B), being only in index fossils (C), or having a similar shape but different use (D is about no use). For example, the appendix in humans is considered a vestigial structure.

Answer:

D. A structure that has no use in the organism