The sequence of the one-way gaseous exchange mechanism in a fish is

  • A gills ⇢ operculum ⇢ mouth
  • B mouth ⇢ gills ⇢ operculum
  • C mouth ⇢ operculum ⇢ gills
  • D operculum ⇢ mouth ⇢ gills

The correct answer is B. mouth ⇢ gills ⇢ operculum

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