For all that is Scientifically related to Cosmology and Space. (NB: Please take discussions about UFOs, possible Alien contact, Crop-Circles, Alien Abductions, Planet-X and Niburu to the ‘Paranormal and Supernatural
’ Message Board).
"As far as I understand it, the life on this one planet arose from a single source."
It must have started from one source, since DNA is base in all kind of life. Unless DNA randomly arose more than one place. However.... there is no base for the notion that DNA can arise randomly at all.
"It wasn't spontaneously independent."