Contents
- Introduction
- Orientation Center
- Room 1 - Vertebrate Origins
- Jaws
- Four Limbs
- Watertight Egg
- Sauropsids
- Antorbital Openings
- Pterosaurs
- Room 2 - Saurichians
- Room 3 - Ornithiscians
- Room 4 - Primitive Mammals
- Room 5 - Advanced Mammals
- Conclusion
The next step on the path is Four Limbs, or tetrapods. Four limbs helped animals swim under water at first and later do other things like digging, jumping, and flying.
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