Life prefers stasis. Evolution is not the natural state of life; conditions must be adverse for the continuation of life before it evolves. Without obstacles to its continuation, life will not evolve.
“It was Williams who first pointed out that a huge false assumption lay, and indeed still lies, at the core of most popular treatments of evolution. The old concept of the ladders of progress still lingers on in the form of teleology: Evolution is good for species, and so they strive to make it go faster. Yet is stasis, not change, that is the hallmark of evolution. Sex and gene repair and the sophisticated screening mechanisms of higher animals to ensure that only defect-free eggs and sperm contribute to the next generation – all these are ways of preventing change. The coelacanth, not the human, is the triumph of genetic systems because it has remained faithfully true to type for millions of generations despite endless assaults on the chemical that carry its heredity. The old ‘Vicar of Bray’ model of sex, in which sex is an aid to faster evolution, implies that organisms would prefer to keep their mutation rate fairly high — since mutation is the source of all variety — and then do a good job of sieving out the bad ones. But, as Williams put it, there is no evidence yet found that any creature ever does anything other than try to keep its mutation rate a low as possible. It strives for a mutation rate of zero. Evolution depends on the fact that it fails.
Tangled banks work mathematically only if there is a sufficient advantage to being odd. The gamble is that what paid off in one generation will not pay off in the next and that the longer the generation, the more this is so — which implies that conditions keep changing.” (63, The Red Queen)
The Red Queen by Matt Ridley