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Structures that remain in a body but no longer have a function are called:
AAnalogous structures
BEmbryonic structures
CVestigial structures
DHomologous structures
Answer & Solution
Correct answer: C. Vestigial structures
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_
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