LetMeExplain: episode 2; fish part 2 are fish sea worms with tails?

Same as before, say what you think before and reply what you think after. Ok, so as stated in episode 1, fish have gills, which worms don't have, but as you stated, SEA worms. Not ordinary worms. But then I thought, "worms have small and thin bodies. Most fish tend to be way larger than worms." And I also thought about the tail, how would worms evolve into fish? But thats just my opinion.

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