21. What does the swim bladder contain? What is the function of the swim bladder?
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Answer:
fish anatomy
helps to swim
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The swim bladder is located in the body cavity and is derived from an outpocketing of the digestive tube. It contains gas (usually oxygen) and functions as a hydrostatic, or ballast, organ, enabling the
fish to maintain its depth without floating upward or sinking.
it helps a fish to swim
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