Darwin's theory is based on key observations and inferences drawn from them:
1. Species have great fertility. They have more offspring than can grow to adulthood.
2. Populations remain roughly the same size, with small changes.
3. Food resources are limited, but are relatively stable over time.
4. An implicit struggle for survival ensues.
5. In sexually reproducing species, generally no two individuals are identical.
"There is no theory of evolution. Just a list of creatures Chuck Norris has allowed to live"
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