"SDL" == Steven D Litvintchouk <sdlitvin@earthlinkNOSPAM.net> writes:

SDL> We do know this: On Earth, life seems to have first formed about
SDL> 600 million years after the formation of the Earth.  The Earth
SDL> itself is 4.6 billion years old.  So that means that life formed
SDL> on Earth in its "childhood".

Yes, but after single-celled organisms appeared, some 600 million
years after the formation of the Earth, single-celled organisms were
the only forms of life for the next 2500--3000 million years.

Is it difficult for multicellular organisms to evolve from
single-celled organisms or was the Earth unlucky?  We do not know.

-- 
Lt. Lazio, HTML police   | e-mail: jlazio@patriot.net
No means no, stop rape.  | http://patriot.net/%7Ejlazio/
sci.astro FAQ at http://sciastro.astronomy.net/sci.astro.html