front 1 Chordates | back 1 D.C = notochord (skeletal support)
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front 2 Craniates | back 2 D.C = head
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front 3 vertebrates | back 3 D.C: Skeleton (vertebral column)
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front 4 Gnathostomes | back 4 D.C: Jaws
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front 5 Osteichthyans | back 5 D.C lung
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front 6 Lobe-fins | back 6 D.C Lobe fins
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front 7 Tetrapods | back 7 D.C Four feet/limbs w digits
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front 8 Amniotes | back 8 D.C amnootic eggs
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front 9 Amniotes (mammalia) | back 9 D.C: hair/produce milk
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