You may use one of the following topics.

        • Primordial Soup Model
        • Lerman's Bubble Model
        • Fossils
        • Cambrian Explosion
        • Previous Mass Extinctions
        • Mutualism
        • First Vertebrates
        • First Jawed Fishes
        • First Amphibians
        • First Birds
        • First Mammels
        • Extinction of the Dinosaurs