What is the term that reflects the belief that humans naturally behave in hedonistic ways to ensure their genes prevail over their competitors?

Question

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The term "the survival of the fittest," coined by Herbert Spencer and popularized by Charles Darwin, reflects the belief that in the process of natural selection, individuals or groups that are best adapted to their environment are more likely to survive and reproduce, thus ensuring their genes prevail. This concept can be interpreted to include behaviors that might be seen as hedonistic if they contribute to an individual's or group's survival and reproductive success.

What Is the Term That Reflects the Belief That Humans