When biologists talk about the "survival of the fittest," the fittest individuals are those that leave the most descendants rather than those that are physically the strongest.

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"Survival of the fittest" refers to the idea that the individuals with traits that are best suited to their environment are more likely to survive and reproduce, passing down those advantageous traits to their offspring. It does not necessarily refer to physical strength or overall fitness.

When Biologists Talk About the "Survival of the Fittest," the Fittest