| A | B |
|---|
| vertebrates | animals with backbones |
| cartilage | flexible material in between the vertebrae |
| vertebrae | individual bones that make up the backbone |
| Chordata | classification: phylum that have gill slits and a notochord during development |
| endoskeleton | support INSIDE the body |
| exoskeleton | support OUTSIDE the body |
| endothermic | warm-blooded; temperature is maintained inside the body |
| ectothermic | cold-blooded: temperature depends on the environment |
| fish locomotion | fins |
| gills | exchange gases between outside (water) and inside (body) |
| three classes of fishes | jawless, cartilaginous, bony |
| EX of Jawless Fishes | lamprey, hagfish |
| EX of Cartilaginous Fishes | sharks, rays, skates |
| EX of Bony Fishes | most fish are in this category |
| swim bladder | needed to maintain buoyancy |
| buoyancy | keeps a body afloat, without going down in the water and drowning |
| spawning | how the demale fish lays eggs in water |
