Darwin's theory of evolution posits that species evolved from basic life forms, based on observations of high offspring production, stable populations, individual variation, and trait inheritance, leading to the conclusion that survival of the fittest drives species change over time through natural selection.
Darwin's theory states species evolved from basic lifeforms. He observed that organisms produce many offspring, populations are stable, individuals vary, and traits are inherited. He concluded a 'struggle for existence' leads to survival of the fittest, passing traits to offspring over time.
| Front | What is natural selection as stated by Darwin? Darwin's 4 important observations: Darwin's conclusions: |
|---|---|
| Back | -That all species have evolved from basic lifeforms that first developed 3 billion years ago. -organisms often produce lots of offspring -populations usually stay the same size -organisms are all slightly different -characteristics can be inherited -There's a struggle for existence. -More organisms born than can survive -The ones that survive are the ones best suited to enviornment and ones that breed(long necked giraffes) -Passing on their characterists to offspring -Over long time characteristics of species change |
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