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Can I take your number? <a href=" http://www.dharmaflix.com/wiki/allegras-window-vhs-promo ">free printable allegra d coupons</a> Of course, this is just one example. We still don’t know whether Hsp90, by concealing and exposing genetic variation, steers the evolution of many species, or just a few. The process seems to rely on sudden environmental changes, and you’d certainly get those in places like deep-sea vents and glacial lakes, or at microscopic scales. But for bigger organisms, “most evolution occurs in gradually changing environments,” says Tabin. Are the blind cavefish the exceptions that prove the rule, or merely the first good example of a common phenomenon?