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JAMB - Biology (2016 - No. 32)
The sequence of the one-way gaseous exchange mechanism in a fish is
gills ⇢ operculum ⇢ mouth
mouth ⇢ gills ⇢ operculum
mouth ⇢ operculum ⇢ gills
operculum ⇢ mouth ⇢ gills
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