(December 17, 2014 at 4:01 pm)polar bear Wrote: It just so happens that we have evolved to breathe oxygen and expel carbon dioxide, and our plant system does this in reverse. Couldn't other forms of life (not necessarily human) breathe and expel different gasses.I don't know if it's possible, but it would be crazy awesome IMO.
"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
