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Q&A What are the limitations of having an internal skeleton composed of dentin?

I'm not certain if it's possible, honestly. I know some cartilaginous fish like sharks and rays that have tooth-like structures lining their skin, called placiod scales, but I've never heard of any...

2 answers  ·  posted 7y ago by Tardigreat‭  ·  last activity 7y ago by Tardigreat‭

Question biology xenobiology