Practice question
Question
Which characteristic allows cartilaginous fishes to remain buoyant in water?
Explanation
Cartilaginous fishes (e.g., sharks) lack an air bladder, but their cartilaginous skeleton reduces weight, aiding in buoyancy. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.
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