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Perhaps life got going, then died out contemplate several times before what became us got going.Perhaps life got started in many many places, expanded it's range until it met other life forms then had a war or perhaps simply absorbed it, both life forms becoming something new.
I've heard it argued that looking at the genome of all life it seems to be all related. But if I made 5 cakes with the same ingredients and in the way there would be no way to tell if the cakes were made in one batch or 5.There has never been a life form discovered that appears alien. However this question has not been looked into very deeply. It's a little like saying elephants don't exist if you have only looked in North America. (I know there are elephants in North America but I'm assuming wild, non captive animals only.)