In addition to Peterson [155-8], you might read Darwin's Origin of Species [the last chapter sums him up and has a famous concluding image] and a biology textbook. Assume the following is a model of natural selection:
- More offspring are produced than can survive to reproductive age.
- Offspring vary in heritable characteristics of form and behavior.
- Some of these variations improve, some lessen, an offspring's survival chances.
- Those offspring with beneficial traits will outproduce those with detrimental traits.
- The result of this diffrential reproduction is natural selection.
Go out and find examples that support these various steps. Look for seeds, for overcrowded offspring, for competing offspring, etc. Can you see the struggle to survive between siblings? Species? Between different species?