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What are placoderms?
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Mar 25, 2018
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What are placoderms?
Biology
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Bjornd
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An extinct class of prehistoric, armoured fish.
Rits
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Mar 28, 2018
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an extinct fish of the Devonian period, having the front part of the body encased in broad flat bony plates.
Klreeher
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Mar 30, 2018
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