AP Biologyeasymcq1 pt
Vestigial structures such as the human appendix are
A.remnants of structures functional in ancestors
B.newly evolved structures
C.structures with no evolutionary explanation
D.always harmful to their owners
Explanation
Core Concept
Vestigial structures are inherited features that have been reduced or modified relative to an ancestral form or function. They can retain present-day functions, so 'vestigial' does not mean 'completely functionless.' Their anatomy is evidence of evolutionary history and common descent.
Correct Answer
Aremnants of structures functional in ancestors
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