| A | B |
|---|
| Agnatha | jawless fish |
| Chondrichthyes | cartilagenous fish |
| Osteichthyes | bony fish |
| Amphibia | double life; frogs; moist, thin skin; 2 chambered heart |
| Reptiles | amniote egg; tough leathery skin; 3-4 chambered heart |
| Birds | amniote egg; incubated; feathers; 4 chambered heart |
| Mammals | hair or fur; viviparous; 4 chambered heart |
| Animalia | kingdom of all vertebrates |
| Chordata | phylum of all vertebrates |
| Vertebrata | subphylum of vertebrates; have a skull, vertebrae, protected spinal cord |
