Fishes, Amphibians, and Reptiles Chpt 11
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12 terms
Terms | Definitions |
|---|---|
 chordate | The phylum whose members have a notochord, a nerve cord, and slits in their throat area at some point in their lives |
| notochord | A flexible rod that supports a chordate's back |
| pharyngeal slits | slits in the throat area, also called gill slits. Fish have them their whole life; in humans, disappear before birth. |
| ectotherms | An animal whose body does not produce much internal heat |
| endotherms | An animal whose body controls and regulates its temperature by controlling the internal heat it produces |
| gills | An organ that removes oxygen from water |
| external fertilization | eggs are fertilized outside of the female's body |
| internal fertilization | eggs are fertilized inside the female's body |
| swim bladder | An internal gas-filled organ that helps a bony fish stabilize its body at different water depths |
| amniotic egg | an egg with a shell and internal membranes that keep the embrto moist |
| fossils | The preserved remains or traces of an organism that lived in the past |
| paleontologist | A scientist who studies extinct organisms, examines fossil structure, and makes comparisons to present-day organisms |
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