Biology
Biology, 20.08.2019 02:30, devbar3416

If a radioactive isotope had a half life of 1 billion years how much of it would be left after 1 billion , 2 billion, 3 billion, and 4 billion years

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If a radioactive isotope had a half life of 1 billion years how much of it would be left after 1 bil...

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