Quote:
Originally posted by CSflim
Why so?
If "simple" life arises on a planet, surely it is only a matter of time for it to evolve into more complex forms?
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Not necessarily. The climate has to be much more hospitable on a planet for intelligent life to form (i.e. animals and the such). Single-celled organisms (Protista I believe, if my biology serves me right) can survive in a cataclysmic shitstorm of a climate. Along with bacteria and other small organisms that are thousands of times smaller than the head of a needle.