Space/Science — HabitableZone

Space/Science » in reply to Buenos dias, protozoa. Hola, amoeba.

rather: from multi cellular life to man

You probably meant "It took 500 million from the apparition of multi cellular life to man", because it took 4 billion years from microbe (bacteria) to man. And this is a very long time, even on geological or cosmic scale. It's about 1/3rd of the age of universe.

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