Biology
Biology, 22.04.2020 01:00, Chloe0095

Help me pls ASAP !!

If it takes 700 million years for half of your the uranium in a rock to decay into lead how old is a fossil that is:

a.) 50% uranium and 50% lead

b.) 25% uranium and 75% lead

answer
Answers: 1

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If it takes 700 million years for half of your the uranium in a rock...

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