Have you ever thought about the difference between something living and something dead? What changes the moment that we, or our pet or a tree stops living? Scientists know that one of the things that distinguishes something that is alive from something that isn't, is its ability to adapt to its environment. A rock doesn't adapt. Nor does a fence post. But we do if we're alive. We generally take it...
12/28/2009 8:28:44 PM