Which of the following is a vestigial structure in the human body?
Correct answer: A. Vermiform appendix
- A. Vermiform appendix
- B. Pancreas
- C. Diaphragm
- D. Thymus gland
Explanation
The appendix is the reduced remains of a large caecum that digests cellulose in herbivorous ancestors, and it can be removed with no loss of digestive function. Vestigial organs are evidence of evolution precisely because a designed structure would not carry a useless remnant. The pancreas and diaphragm are fully functional, and the thymus, though it shrinks after puberty, is essential for training T lymphocytes.
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Evolution is the heritable change in populations over generations, driven by mutation, recombination, natural selection, genetic drift and reproductive isolation. Questions examine variation, adaptation, survival and reproduction, speciation, fossil and anatomical evidence, and the difference between individual acclimatization and evolutionary change in a population.
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