In humans, gill pouches have evolved into which of the following organs?
Correct answer: D. Eustachian tubes
- A. Nose
- B. Ear
- C. Pharynx
- D. Eustachian tubes
Explanation
Option D is correct because gill pouches help the fish obtain oxygen from water. Similarly, the Eustachian tubes don't perform the same function but do have same embryonic origin.The eustachian tube is a tube connecting the middle ear to the nasopharynx that serves three main functions: balancing pressure in the middle ear, protecting it from pathogens and loud sounds, and draining secretions. It is normally closed but opens during swallowing, yawning, or sneezing, which you may feel as your ears "popping".
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Evolution describes heritable change in populations over generations through variation, natural selection and adaptation. Lamarckism explains inheritance of acquired characteristics, while Darwinism explains selection of favourable inherited variations; these historical explanations must not be confused with the modern genetic account of evolutionary change.
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