I may have overstated this to simplify.<quoted text>
Oh wait a minute, I thought you people claim to be so intelligent. What your saying is "The species "changed only due to the fact that they needed to change in order to survive." Given this information,than only one species would be here on earth,for all died because they had to change because they could not survive as they originally were. Interesting, hummmm maybe evolution is not a fact. there goes my wishful cattle farm. darn,wish you people could give us a better explanation.
A change is not likely be passed on for long if the change is not condusive for the environment.