Explain how the concept of the “survival of the fittest” relates to the theory of evolution.

Darwinian is the creator of the survival of the fittest and his concept of the the evolution theory was the mechanism of natural selection. but in Darwinian term its "Survival of the form who will have the most copies of itself in successful generation" mean over the years that animals adapt to there environment in order to live and this process is call Evolution

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only the strongest survive

He would absorb the wound