A very unpredictable environment—one in which resources, hazards, and competitors may fluctuate rapidly—selects for organisms that produce more offspring earlier in their lives, because it is never certain whether they will survive to reproduce again.
En meget uforudsigeligt miljø, hvor resurser, farer, og konkurrenter er tilstede, vælger organismer at producerer mere afkom tidligere i deres liv, fordi det er aldrig sikkert, om de vil overleve til at reproducere igen.