Predators that maintain marine balance., , They lay eggs or give birth to live young., , Covered by dermal denticles., , Largest fish in the world, feeds on plankton., , More than 500 species., , They need to move to breathe., , Made of cartilage, not bone., , Many species are threatened., , They replace thousands of teeth throughout their lives., , Excellent sense of smell and electroreception., .

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