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Stages:
1
- Primitive Vertebrate (Jawless)
2
- Basal Gnasthostome (Jawed Fish)
3
- Generalized Lobefinned Fish (Water)
4
- Generalized Lobefinned Fish (Air)
5
Primitive Tetrapod
6
More Derived Tetrapod (Anamniote)
7
Basal Synapsid "Mammal-Like" Animal
8
Mammal
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