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

User Saeed Hassanvand
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Answer:

development of a backbone

Step-by-step explanation:

User Meriadec
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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
User Ben Dilts
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