All chordates possess a true mouth with upper and lower jaws.

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All chordates possess a true mouth with upper and lower jaws.

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Detailed Solution

All chordates do not possess a true mouth with upper and lower jaws. Chordata include divisions Agnatha and Gnathostomata. The Division Agnatha includes the organisms which lack jaws and the Division Gnathostomata includes the organisms which bear jaws.

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