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Examples (Orders, Species), Unique characteristics, etc.
Hagfish and lampreys
notochord and cartilaginous skull
jawless, finless, marine fish that lack vertebrae

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cartilaginous fish - skeleton made of cartilage
1st with teeth

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"fish acting in a play get a spotlight, or a ray of light"

Ray-finned fish
Bony skeleton
Swim bladder
Operculum - covers gills

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Lobe-finned fish
Lungfish
1st to move onto land, transition to tetrapods

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3 chambered hearts
skin can absorb oxygen
metamorphosis regulated by thyroid
must return to water to reproduce

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amniotes
turtle, crocodile/alligator, lizards/snakes, birds

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mammary glands
hair
specialized teeth
3 major groups