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Gill
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sand tiger shark (Carcharias taurus)
Axolotl wearing a green paper hat in the style of Peter Pan, with speech bubble reading “I'll never grow up!”
Illustration showing different animals and their respiratory organs: a spider with book lungs, a chicken with lungs, a sponge with labeled inflow and outflow pores, a fish with gills, and a caterpillar with spiracles.
Study the roles of a fish's scales, swim bladder, and gills in its respiratory system
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Gill: Media

respiratory system
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Videos

What is So Unique About the Axolotl?
Axolotls are kind of the Peter Pan of salamanders.
Video: Encyclopædia Britannica, Inc.
Study the roles of a fish's scales, swim bladder, and gills in its respiratory system
The scales, swim bladder, and gills of the ray-finned fishes.
Video: Encyclopædia Britannica, Inc.

Images

sand tiger shark (Carcharias taurus)
The sand tiger shark (Carcharias taurus), along with the smalltooth sand...
Jeff Kubina
respiration: animals
Different methods of respiration in animals.
Encyclopædia Britannica, Inc.
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