Natural selection brings about evolution because it removes the negative traits leaving the positive and neutral traits to pass on to the next generation.
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Darwin's theory
Observations
- all organisms over reproduce
- population numbers remains constant over long periods of time
- organisms within a species vary
- some of these variations are inherited
Conclusions
- there is competition for survival
- organismns with best characteristics that best adapt them for their environment are most likely to survive and reproduce
- if these characteristics are inherited they will be passes on to their offspring
