Doesn't other life-2 floating around in the primordial soup look like food to life-1? Or wouldn't it be co-opted mitochondria style?
From biochemical similarities, the chirality of certain sugars and amino acids, dna similarities, etc. the evidence for a single common ancestor of all life on Earth is fairly strong; however we don't really have evidence that there never were other lifes that simply were outcompeted at their very early stages.
And it was all apparently very difficult, from our point of view, but that aspect of creation -- and more specifically, its Creator -- are beyond the ken of creatures such as ourselves, even with our vastly superior talents and abilities. Very few of us reach the pinnacle of our ability to commune with the vast information system that is the universe around us.
"It is so wonderful, now that I am in in a constant conversation with You." --Rumi (my paraphrase from memory)
"The Way goes in." --Rumi
Many of the people in this world don't have the balls to take that leap. ahem
what did you smoke to get this power?
There are various studies to undertake and many serieses of tests to pass before one gets full access. I know enough to know I'm not there yet, but have made some progress. The feedback system of the universe informs us continually of our progress, it being perfectly correlated with our inner peace and happiness.
"You have no idea how little we care about what people say." --Rumi