Picture your family tree; exponentially expanding back, through the generations. How far do you imagine it extends?
Do you extend your ancestral family tree to include proto-human species, from millions of generations ago? Since there was never a clearly demarcated "line" between proto-human and human —why not keep going back along your mammalian-portion in your family tree?
But, how can you choose to stop looking back along that massive pyramid of organic life-forms at the "mammal-lizard" that must have been your ancestor a few hundreds-of-millions of generations ago? Is it because of the warm-blooded versus cold-blooded seems too "alien" (too far away from human)?
Keep going. There were billions of generations of single-celled organisms, which thrived on sunlight or carbon dioxide (or some other food-source) until there was sufficient levels of their waste-products (oxygen) to allow multi-cellular life to procreate and survive. Your family tree should include some portion of those small animals, right?
There is one long ancestral line of survivors who duplicated or cloned, then they spawned, later they birthed, which leads from some combination of inorganic proteins (think: RNA-virus) to you.
Every one of those organic organisms should be in your imagined family tree. And, why stop there? I expect it's because consciousness, and the organic drive-to-survive, may not have been (and may still not be?) present in inorganic proteins.
Is it probable that inorganic proteins were/are unaffected by the extreme temperatures, radiations, and vacuum-conditions of space—during the ten billion years between the universe's expansion and the point when the third planet away from the star (now called: Sol or The Sun) cooled sufficiently enough for those viruses to crash land and begin their job of Terra-forming?
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