Time since the emergence of earliest fish

Time since the emergence of earliest fish (530 million y)

/fact/time-since-the-emergence-of-earliest-fish

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Time since the emergence of earliest fish (530 million y)

is 1/4 of Time since the emergence of multicellular life (2.1 billion y)...more
is 200 x Age of earliest stone hand axe (2.6 million y)...more

If this was a standard unit ...