1. Class Notes 2
Natural Selection

2. I. Natural selection
Darwin’s most famous idea to explain how species evolve.
Based on artificial selection

3. II. How it works In any population, there is variety.
ex: a population of green and brown beetles.

4. 2. Some organisms survive longer than others.
Ex: Birds eat green beetles more than brown.

5. 3. Those that live to reproduce will pass on their traits through heredity.
Ex: The surviving brown beetles have brown baby beetles.

6. 4. Over time the population will be different.
Ex: Eventually all beetles are brown.

7. Summary
Show the steps of natural selection in a picture.