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breathing increase in size as they ascend to the top surface

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If you observe the movement of fish in an aquarium very carefully you can find that the air bubbles formed due to the breathing increase in size as they ascend to the top surface. Can you explain why?

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The breathing that increases in size as they ascend to the top surface are determined.

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The pressure of water in the aquarium is the smallest at the top of the surface and increases with depth. ...

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