Question

which structure describes a body part that is no longer used but still present in modern organisms?
a analogous
b homologous
c vestigial

Explanation:

To determine the correct answer, we analyze each option:

• Option a (Analogous): Analogous structures have similar functions but different evolutionary origins, not related to being unused.
• Option b (Homologous): Homologous structures are similar due to common ancestry, often with similar functions or underlying structure, not about being unused.
• Option c (Vestigial): Vestigial structures are body parts that have lost their original function through evolution but remain in modern organisms (e.g., human appendix, tailbone). This matches the description of a body part no longer used but still present.

Answer:

c. Vestigial