What are the 3 classifications of fish?

  • Thread starter Thread starter Leslie B
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Leslie B

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I know there is bone-structured fish, cartilagineous fish, and the other one is some thing that hagfish belong to. Which one is it?
Also, what is a seahorse classified as?
And what are those stinging beds of hair-like stuff that clownfish live in classified as?
What are some examples of round/flatworms that live in the ocean
 
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