How do bony fish regulate buoyancy?
A) With an air-filled swim bladder
B) With a protective operculum
C) By constantly swimming at an upwards angle
D) Through the calcium in the bones, which makes the skeleton lighter than the water
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A)Lives on land, has
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A)echinoderms
B)mollusks
C)chordates
D)arthropods
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A)give birth to live young
B)are
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A)A type of
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