Re: What's the point of speaking of evolution as having purp
John Creasy wrote:Can you prove that a single celled orgainism is my ancestor?
The logical inference from evolution is that single celled organisms are our ancestors. Does that bother you?
John Creasy wrote:Why didn't all single celled organisms evolve?
I'm not sure what you mean. Almost every population changes over time (change of allele frequency in the gene pool over time, is the basic definition of evolution), but not every line leads to something which survives. Extinction is the norm, not the exception. A tree grows many small branches, but not all of them live long enough to become mighty limbs. Only a few survive, and then smaller branches grow from them and the process happens again. Evolution is similar.
John Creasy wrote:How did the first organism just magically come to life from nothing?
We don't know. We have theories, but no single theory on origins has gained preeminence over the other theories (unlike the Theory of Evolution which is not only the dominant theory, but the *ONLY* scientific theory which explains everything we see in such detail).
Just to be clear, the Theory of Evolution does not include an explanation for the origin of life, it only describes how life has evolved, not how it originated.
However, evolution does have implications on the origin of life simply because the process of evolution is so powerful that we can easily see how it could have effected life all the way back to just after replicative mollecules occured. *How* those first replicative molecules first occured however, is not well known.