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(D) Natural selection,as proposed by Charles Darwin,is primarily based on observable facts and phenomena in nature. $1$. Darwin observed that individu

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(D) Natural selection,as proposed by Charles Darwin,is primarily based on observable facts and phenomena in nature. $1$. Darwin observed that individuals within a population exhibit variations. $2$. He noted that resources are limited,leading to a struggle for existence. $3$. Individuals with advantageous variations are more likely to survive and reproduce,a process known as differential reproduction. $4$. These observations of natural phenomena form the foundation of the theory of natural selection.

Natural selection is based on which of the following?

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