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________ research is undertaken to help identify problems that are not necessarily apparent on the surface and yet exist or are likely to arise in the future.
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.
Countercurrent Exchange
A mechanism in organisms where two fluids flow in opposite directions, exchanging properties (such as heat or solutes) to allow for efficient transfer.
Concurrent Exchange
A mechanism often seen in biological systems where two substances flow in opposite directions and exchange properties or elements, enhancing efficiency.
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