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Which of the following is true for a constant cost industry?
Dermal Gills
Respiratory structures in some aquatic animals that allow for gas exchange directly through the skin.
Book Lungs
Respiratory organs in certain arachnids, such as spiders and scorpions, consisting of stacked plates for gas exchange.
Operculum
In bony fishes, a protective flap of the body wall that covers the gills.
Swim Bladders
Gas-filled sacs in fish that help maintain buoyancy in the water column.
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