In humans, gill pouches have transformed into which of the following organs?
Correct answer: D. Eustachian tubes
- A. Nose
- B. Ear
- C. Pharynx
- D. Eustachian tubes
Explanation
In human embryonic development, gill pouches transform into the eustachian tubes, which are essential for maintaining equal air pressure on both sides of the eardrum and facilitating fluid drainage from the middle ear to the throat. This transformation reflects the evolutionary adaptation of embryonic structures to serve specific functions in adult anatomy. The other options, such as the nose and pharynx, arise from different embryonic origins and are not derived from gill pouches. While the 'Ear' option is related, it lacks specificity, as it does not emphasize the role of the eustachian tubes.
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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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