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It could happen.
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When you find a population that doesn't exhibit variation yet continues to survive sweeping changes in its environment, then you have evidence against evolution.
You are quoting me as if you found some population that doesn't change with sweeping changes in the environment. What sweeping changes in the environment that crocodiles live in have occurred between the time those fossils were alive and now?
Do you think that because the environment the fossils are found in is different than the environment that the crocodiles live in now, that they used to live in that environment and now live in the water?

A faith that connot survive collision with the truth is not worth many regrets. -- Arthur C. Clarke