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They're both extinct bony fishes. The difference is that ostracoderms were jaw-less and placoderms had jaws.

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12y ago

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What would not an attribute of ostracoderms?

Ostracoderms were ancient fish with an an armor of bony plates. However, your question is very muddled and therefore we can not answer it properly.


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primtie finsJAWSOstracoderms were jawless fishes with bony armor that protected them from predators.