Chondrichthyes Predaceous Due Absence Air Bladder Swim Constantly

Chondrichthyes are predatory and require constant swimming to prevent sinking because they lack an air bladder.

Chondrichthyes are predatory and must swim constantly to avoid sinking due to the absence of an air bladder.

Text	chondrichthyes are predaceous. Due to the absence of air bladder, they have to swim constantly to avoid sinking.

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