Biology, 18.05.2021 04:40 oomale

3. A crinoid stem fossil had 900 grams of C-14 in it when it died. When the fossil was discovered it had 112.5 grams of C-14 left. How many half lives have passed? How old is this fossil?

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3. A crinoid stem fossil had 900 grams of C-14 in it when it died. When the fossil was discovered it...