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thebeagle96 thebeagle96
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6 years ago

Late Silurian through Permian plate-skinned fish with jaws and bony armor, especially in the
  head-shoulder region:a.
   placoderms d. chordates
  b. ostracoderms e. therapsids
  c. pelycosaurs

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6 years ago
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6 years ago
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