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I need help answering this question. Describe how physostomes regulate the amount of air in their...

I need help answering this question.

Describe how physostomes regulate the amount of air in their swim bladders.

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Answer #1

Physostomes have a pneumatic duct which connects the swim bladder to the alimentary canal, allowing them to fill and empty the bladder by their mouth rapidly which helps in regulating the amount of air in their swim bladders.

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