Fittest

This is an example of the survival of the fittest, as it is called.

The fittest survive. What is meant by the fittest? Not the strongest; not the cleverest— Weakness and stupidity everywhere survive. There is no way of determining fitness except in that a thing does survive. "Fitness," then, is only another name for "survival." Darwinism: That survivors survive.

Tatoeba: Let the fittest sentence survive!

Let it be survival of the fittest, but quickly and carefully directed.

It's survival of the fittest.

Each age has deemed the new-born year the fittest time for festal cheer.

Natural selection explains "only the survival of the fittest, not the arrival of the fittest".