About otherlife...we could have very weird lifeforms on our planet. In the history of life, there have been 5 massive waves of extinction. The most horrible (before the dinosaurs) wiped out about 98.8% of life on earth. We all know how very different were lifeforms at the times of trilobites. If there wouldn't be those mass-extinctions, then perhaps there would be sorting animals into groups according to that how many eyes they have...
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