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What is this concept of "need"? Organisms do not "need" to improve. And there are no circumstances where organisms do the equivalent of telling their genes "Alright, boys. You can stop mutating now. I'm adapted to my environment!" Are you trying to tell me that the common fruit fly is perfectly adapted? That there have been no possible positive mutations in the last 200 or so million years?
Doh... The "need" I was refering too is what Clyde has already described (in great detail) to you as "selective pressure". Nothing is 'telling' their genes anything. They dont ever stop mutating per se, either. And for the