Why is there only one Tree of Life ?

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Darryl
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If it is claimed that with liquid water, life will probably form, why then would there be only one tree of life on Earth where all life started ?

Why is there not a forest of trees, if the conditions are favourable ?


Or is it the case there there were possibly more than one and they combined at some stage of evolution ? Like viruses ?

And does all life on Earth belong to the same basic DNA based tree of life, or has there been examples (deep water vents or something) where life has appeared to have developed independly to our DNA based life.

Thanks a lot, and I hope its not a silly question :)
 
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