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Why don't roundworms flatworms and annelid worms belong to the same group of invertebrates?
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Why don't roundworms flatworms and annelid worms belong to the same group of invertebrates?

User Kevinnls
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Because they have a big difference between each other such as the way the circulatory system works, or if they have or not sensory lobes, if they have or not ganglia, etc.

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User Reki
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