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First Life Form (Sea Squirts (Trilobites (Mollusks (Sponges (Sea Stars))))…

- - - - Sponges
        
        Sea Stars
        
        Flatworms
        
        Jellyfish
        
        Jawless Fish
        
        Bony Fish
        
        1 more item...
- - - - Milipedes
        
        Scorpions
        
        Spiders
        
        Frog
        
        Mammals
        
        Reptiles
        
        1 more item...
- - - - Ferns
        
        Ginkgoes
        
        Liverworts
        
        Cycads
        
        Conifers
        
        Horsetails
        
        1 more item...