Answer the following question given this paragraph: 

Some of the most interesting kinds of evidence for evolution are body parts that have lost their use through evolution ( Figure below ). For example, most birds need their wings to fly. But the wings of an ostrich have lost their original use. Structures that have lost their use through evolution are called vestigial structures . They provide evidence for evolution because they suggest that an organism changed from using the structure to not using the structure, or using it for a different purpose.


Q: Structures that have lost their use through evolution are called _______

 Choices:

- primordial structures

- residual structures

- symbiotic structures

- vestigial structures

A:
vestigial structures
