[Gorduz]

Your first question has nothing to do with teaching I.D. To the second question: Life probably started by some freak chemical reaction, but there could be other theories as well(As said I'm no biologist). However due to lack of experimental data (digging up million years old single cells are hard) I don't think anyone knows.

I think perhaps you also ask how did it all began (life, universe, etc.). There are theories but in the end the question, of why it happend will have to be answered by religion as it is probably impossible to investigate it scientificly. Most atheists probably answer that that question is irrelevant, most religious scientist probably believes (at least I do) that questions marks the end of sciense and the starting point of faith.