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5 March, 19:18

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

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  1. 5 March, 22:09
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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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