A) gills
B) gill slits
C) external ear (pinna)
D) eyebrows
Correct Answer: B
Solution :
All the chordates (including humans) at some stages of their life cycle, contain a series of paired lateral gill clefts or gill slits. These are finger like hollow pouches grow out from pharyngeal wall and meet with corresponding in pocketing of body wall. In lower chordates, gill clefts serve as respiratory organs but in higher chordates, these are present only during embryonic development.
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