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Among The Most Primitive Vertebrates Is The Group Agnatha, Comprised Of Hagfish And Lampreys. Agnatha Are Named For Their Lack Of Which Structure Used In Feeding? In Humans The Upper Part Of This Structure Is Fixed, Whereas The Lower Part Is Movable And Called The Mandible.

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1. Among The Most Primitive Vertebrates Is The Group Agnatha, Comprised Of Hagfish And Lampreys. Agnatha Are Named For Their Lack Of Which Structure Used In Feeding? In Humans The Upper Part Of This Structure Is Fixed, Whereas The Lower Part Is Movable And Called The Mandible.





 
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