The forelimb of a whale, a bat and a human have the same arrangement of bones but perform different functions. Such organs are described as
Correct answer: B. homologous
- A. analogous
- B. homologous
- C. vestigial
- D. acquired
Explanation
Homologous organs share a common structural plan and a common embryonic origin because they were inherited from a shared ancestor, and their different uses are the result of divergent evolution. Analogous organs are the opposite case: same job, different structure and origin. Vestigial organs are reduced remnants that have lost their original function altogether.
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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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