| A | B |
|---|
| vertebrate | animal with a back bone |
| chordate | phylum of vertebrates, have a nerve cord, notochord, and gill slits |
| cold blooded | internal body temp. changes with environmental temp. can't produce much internal heat |
| warm blooded | maintains a constant internal body temp. |
| fish | water dwelling vertebrates have scales, fins, throats with gill slits |
| external fertilization | sperm joins egg outside the body |
| internal fertilization | sperm joins egg inside the body |
| jawless fish | most primitive of all fish, has no jaw, no scales, no fins, make of cartilage |
| cartilaginous fish | made of cartilage, tooth like scales, ex. sharks |
| bony fish | skeleton made of bones, have paired fins, ex. trout |
| swimbladder | gas filled sac that gives fish buoyancy |
| lateral line | sensory line down side of fish's body, detects movement and sound |
