Who coined the concept "survival of the fittest"?

Question

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The concept "survival of the fittest" was coined by Herbert Spencer, a British philosopher who was heavily influenced by the work of Charles Darwin. While Darwin did use the term "fit" in his discussion of natural selection, he did not use the phrase "survival of the fittest." Instead, it was Spencer who popularized the term to describe the idea that individuals or groups best adapted to their environment will thrive and succeed in the struggle for existence.

Who Coined the Concept "Survival of the Fittest