Structures that remain in a body but no longer have a function are called:

1. Evolution modifies what already exists rather than starting from scratch. 2. Sometimes a structure loses its role but is not fully removed. 3. These unused structures without function are called vestigial structures. 4. Homologous structures, by contrast, still work but were inherited from a shared ancestor. _Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 18 'Evolution and the Origin of Species', sections 18.1-18.3_