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30 September, 14:07

Which milestone in the evolution of animals classifies them as either vertebrates or invertebrates?

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  1. 30 September, 15:19
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    I could be wrong here, but I believe that the classification of vertebrates or invertebrates is based of if the organism in question has a central spinal column or just a spine at all.

    Vertebrae - animal with spine

    Invertebrate - animal w/o spine
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