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Biology, 05.05.2020 00:05 carlossauceda0

HELPhelp ASAP)If a substance has a half-life of 45 days, how much of the original substance would be left after 90 days?
A. One half (1/2)
B. One quarter (1/4)
C. One eighth (1/8)
D. One tenth (1/10)

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