Gill
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Gills are what fish, amphibians, and some other animals use to breathe in water. They have feathery parts that trap air which contains oxygen. Fish and frog gills are hidden on the sides of their heads. Sharks have many gills slits on their necks. Baby salamanders have gills that stick out like leaves from their heads.
In mushrooms, gills are the spore-bearing structure in agarics (gilled mushrooms).
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Gills
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