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Assume you can trace you're ancestry back to one-celled organisms. Using what we know about average life spans over different eras and an appropriate average generation length, how many greats would your most recent one-celled ancestor have in front of grandpa?

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Assume you can trace you're ancestry back to one-celled organisms. Using what we know about average life spans over different eras and an appropriate average generation length, how many greats would your most recent one-celled ancestor have in front of grandpa?	15