| A | B |
|---|
| vertebrate | animal with backbone |
| pharyngeal pouch | characteristic of all chordates: like gills |
| dorsal nerve cord | characteristic of all chordates: can become spinal cord |
| notochord | rod-like support structure; characteristic of all chordates |
| endothermic | warm blooded; internal body temp |
| exothermic | cold blooded; external body temp |
| oviparous | lay eggs outside of body |
| ovoviviparous | eggs mature inside of mother; live births |
| viviparous | embryo matures inside mother nurished by mother |
| amniote egg | egg containing yolk; nurishment |
