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Figure 27.2
Fishes that have swim bladders can regulate their density and thus their buoyancy.There are two types of swim bladder: physostomous and physoclistous.The ancestral version is the physostomous version,in which the swim bladder is connected to the esophagus via a short tube (Figure 27.2) .The fish fills this version by swimming to the surface,taking gulps of air,and directing them into the swim bladder.Air is removed from this version by "belching." The physoclistous version is more derived and has lost its connection to the esophagus.Instead,gas enters and leaves the swim bladder via special circulatory mechanisms within the wall of the swim bladder.
-The presence of a swim bladder allows the typical ray-finned fish to stop swimming and still
Scandinavian Countries
A region in Northern Europe, consisting of Norway, Denmark, and Sweden, known for their high standards of living and well-developed social welfare systems.
Cooperative Groups
Cooperative groups are organizations formed by individuals who voluntarily collaborate for their mutual social, economic, and cultural benefit.
Product Liability Insurance
Product liability insurance is a form of business insurance designed to protect manufacturers, distributors, suppliers, or retailers against financial loss due to legal action from product-related injuries or damages.
Child's Car Seat
A safety seat designed specifically for children in vehicles, aimed at protecting young passengers in case of a crash or sudden stop.
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