Question

Inter-relationship among ostracoderms and placoderms

Answer 1

Explanation:

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Answer 2

Answer:

ostracoderms had separate pharyngeal gill pouches along the side of the head, which were permanently open with no protective operculum. Unlike invertebrates that use ciliated motion to move food, ostracoderms used their muscular pharynx to create a suction that pulled small and slow moving prey into their mouths

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