Agnatha, the superclass of jawless fish in the phylum Chordata, includes both present (cyclostomes) and extinct species. Cyclostomes, such as lampreys and hagfishes, lack jaws and have unique adaptations. They have primitive characteristics like a circular mouth and lack of paired fins, alongside sp

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This content provides an overview of the classification and organization of the animal kingdom. It covers topics such as levels of organization, symmetry types, diploblastic and triploblastic organization, coelom types, and segmentation in animals. The information is structured with images and descr

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