the process of natural selection
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Animal A is unsuited for its environment and dies of exposure/starvation/heat stroke/whatever. Animal B is well suited to its environment and survives long enough to fuck. Animal B is going to have little copies of it running around, A doesn’t.
Note that “fitness” for evolution isn’t the same as “fitness” for Planet Fitness. Animal A could be some muscular gigachad that’s faster, deadlier, smarter and sexier than Animal B. If it finds itself in an environment that has scarce food (say, a desert), all those extras will have a huge extra energy draw and it will starve to death while the scrawny little Animal B who happens to be *very* efficient at living off of two bites of cactus and a random moth per day will have no trouble.
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