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Darwin's four observations include: 1) individuals within a species vary in their traits; 2) some of these variations are heritable; 3) organisms produce more offspring than can survive; and 4) there is a struggle for existence due to limited resources. From these observations, he made two deductions: 1) individuals with advantageous traits are more likely to survive and reproduce, leading to natural selection; and 2) over time, this process can result in the evolution of new species.

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3w ago

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