How Do Ray-Finned Fish Keep from Sinking

question 56

Multiple Choice

How do ray-finned fish keep from sinking?

• A) They are constantly swimming.
• B) Their fins are constantly moving.
• C) They have lungs that are always filled with air.
• D) They have a swim bladder that is filled with gas.
• E) They have a skeleton that is less dense than the surrounding water.

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Definitions:

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