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Though there's a certain reasonableness to thinking of the "ancestral critter," the situation is more likely to have been that there were lots and lots of organic compounds which began to assemble into "not-quite-critters." These then joined with other "none-quite-critters" into "somethings-very-like-critters" and so on until, looking back on the matter, someone might have been able to say, "the ancestors of these were the first critters."

In other words, the line between organism and proto-organism is somewhat arbitrary.

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Q: What was earth like at the time when there was only one organism?
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