Mattdogdmc12 Mattdogdmc12

21-04-2017
Biology

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

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21-04-2017

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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24-05-2022

Answer:

development of a backbone

Explanation:

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