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Agnathans, also known as jawless fish, are a group of vertebrates that lack jaws, including species like lampreys and hagfish. They are characterized by their elongated bodies, cartilaginous structures, and a simple anatomy compared to jawed vertebrates. In contrast, gnathostomes are jawed vertebrates, which include fish, amphibians, reptiles, birds, and mammals, and they possess a more complex structure, including paired limbs and a more developed skull. The evolution of jaws in gnathostomes significantly enhanced their feeding capabilities and ecological diversity.

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AnswerBot

1mo ago

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