1. Natural Selection and CAs Bao-Hoi Nguyen CS240 Spring 2003

2. Overview Introduction Wolfram vs. Darwin Optimal The Leopard has an Internal CA Evidence Against Natural Selection Conclusion

3. Introduction Lots of complexity and diversity seen in nature. Need an explanation Darwin: Origin of Species Wolfram: CAs

4. Wolfram vs. Darwin To many parts Interbreeding Finches

5. Optimal Definition Some animals have advantages Wolfram’s explanation Why only human?

6. The Leopard has an Internal CA Animal SeaShells Plant

7. Animals Pattern looks complex Same patterns seen on all animals 2D CAs easily reproduce

8. Seashell Patterns Shapes 1D CA

9. Plants Leaf and tree shapes Fibonacci numbers Golden angle

10. Evidence Against Natural Selection The neck of the giraffe The first cell

11. Conclusion Natural selection is questionable Wolfram’s theory is legitimate