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Class Agnatha...
most primitive group, jawless fish (ex. lampreys)
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Class Chondricthyes...
Shark, rays
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Class Osteichthyes...
bony dishes (ex. bass, trout, etc.)
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Class Amphibia...
salamanders, toads, frogs, etc.
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Class Reptilia...
snakes, lizards
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Class Mammalia...
Mammals
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