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all members of the phylum are called this . at some point in their lives they will have a notochord and slits in the throat area
an animal whose body regulates its own temperature by controlling the internal heat it produces
a vertebrae that lives in water and uses fins to move - has fins, ectotherms usually, gills, and scales
an internal , gas-filled sac that helps the fish stay stable at different depths in the water (bonyfish)
the organs of air-breathing vertebrates in which oxygen gas and carbon dioxide gas are exchanged between the air and the blood
the scientists who study extinct organisms , examine fossil structures & make comparisons to present day organisms
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