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What is the backbone-like structure in marine organisms with a backbone?
What is the backbone-like structure in marine organisms with a backbone?
Which class of fish has non-replaceable placoid scales?
Which class of fish has non-replaceable placoid scales?
Which subclass of cartilaginous fish includes rays, skates, and sharks?
Which subclass of cartilaginous fish includes rays, skates, and sharks?
Which marine organisms are chordates but do not have a backbone?
Which marine organisms are chordates but do not have a backbone?
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What is the feeding mechanism of jawless fish (Agnatha)?
What is the feeding mechanism of jawless fish (Agnatha)?
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