| Term | Definition |
|---|
| notochord | firm but flexable cord that supports the body |
| operculum | the covering over gill slits in bony fish |
| swim bladder | an air sack that allows boyancy |
| lateral line system | sensory system for detecting movement in water, first seen in cartaliginous fish. |
| amniotic egg | provides a complete environment for embryo develpment |
| cartilage | tough, flexable tissue |
| ectotherm | cold-blooded |
| endoskeleton | an enternal framework made up of bone and cartilage |
| estrivation | a period of inactivity in hot/dry weather |
| hibernation | a period of inactivity in cold weather |
| vertebrate | organism with a backbone |
| chordate | organism with notochord, postanal tail, nerve cord, and dorsal gill slits |
| endotherm | warm-blooded |
| gestation period | the period of development from fertalization to birth |
| placenta | saclike organ in which a placental embryo develops |
| umbilical cord | connects the embryo to the placenta |
| preening | process in which birds rub oil from oil glands over it's feathers to condition and waterproof them |
| fish | animals with fins, scales, and gills |
| crocodile | narrow head, traingular snout |
| alligator | broad head, rounded snout |
| scales | hard, thin plates that cover the skin and protect the body |
| biological indicator | species whose overall health reflectrs on the health of the environment |
| "amphibian" (meaning) | "double life" |
| fins | fanlike structures in fish used for steering and balancing |
| the four hallmarks of all chordates | notochord, postanal tail, dorsal nerve cord, gill slits |
| monotremes | mammals that lay eggs; the duck billed platypus |
| marsupials | mammals with an external pouch; kangaroo |
| placentals | offspring who develop inside placenta; humans |
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