write short note Darwin's theory
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The theory of evolution by natural selection, first formulated in Darwin's book "On the Origin of Species" in 1859, is the process by which organisms change over time as a result of changes in heritable physical or behavioral traits. Changes that allow an organism to better adapt to its environment will help it survive and have more offspring.
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- the size of population remains same , constant despite the fact that more offsprings are produced than needed.
- Variations provide adaptations.
-The best adapted oraganism survive in the changing environment
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