7. How do fish do gas
exchange?

Gap-fill exercise

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Fish “breath” through . Gills,or
branchiae, are vascularized
organs specialized gas exchange
under and present in
animals (marine annelids, ,
fish and tadpoles). are a
respiratory (analogous, for
example, lungs) containing very
lamellae with many blood
vessels in contact with water.
osteichthyes the gills covered by
a flap that protectsthem
operculum. In chondrichthyes are
no opercula.