"perhaps the evolution of life, or multi-cellular life, or animal life, or intelligent life, etc - is so unlikely ..." Bacterial life appeared on Earth pretty

"perhaps the evolution of life, or multi-cellular life, or animal life, or intelligent life, etc - is so unlikely ..." Bacterial life appeared on Earth pretty much as soon as the planet had cooled down. An argument could be that some extremely unlikely chemical coincidence was needed to create life, but I think the observation gives more support for the theory that if you have a planet with prebiotic soup, the biotic part is going to kick in pretty soon. But then it took 4 billion years -- or 30% of the whole universe's lifetime -- for life to invent multicellularity (with some important steps, like the invention of nucleus and thus eukaryotic cells, still unicellular life, half-way in between). I don't have a problem believing that bacterial life is abundant in the universe. But life on Earth, inventing multicellularity only in 4 billion years, and then sentience only in 0.6 billion more (multicellularity obviously being the harder part), is among the fast ones. Wait another 4 billion years to give the slower ones a fair chance to discover multicellularity, too.