(March 2, 2014 at 5:21 am)fr0d0 Wrote: If the crabs environment changed it would have to adapt to it to survive. It just happened to hit on the perfect guise to fit it's environment as that changed, or its environment stayed the same.It can also be that it has made adaptations that do not affect its appearance, or more likely that it hasn't run into any worthwhile competition for the resources it needs to survive. There are at least a few creatures on Earth that have changed very little, in evolutionary time. Sharks and crocodiles come to mind. They've mostly gotten smaller, but otherwise look very similar to their millions-year-old ancestors.
"Well, evolution is a theory. It is also a fact. And facts and theories are different things, not rungs in a hierarchy of increasing certainty. Facts are the world's data. Theories are structures of ideas that explain and interpret facts. Facts don't go away when scientists debate rival theories to explain them. Einstein's theory of gravitation replaced Newton's in this century, but apples didn't suspend themselves in midair, pending the outcome. And humans evolved from ape- like ancestors whether they did so by Darwin's proposed mechanism or by some other yet to be discovered."
-Stephen Jay Gould
-Stephen Jay Gould
