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Carbon-14 has a half-life of approximately 5,730 years. How many half-lives have occurred in a sample that contains 25 percent of the original amount of the parent isotope? 1 2 3 4

Biology
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@bobbylynn u know the answer?
?
ask someone :)

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Other answers:

ok i did
hmu when you got the answer
The half life of carbon 14 is 5700 years. So If a fossil is 5700 years old then half of the carbon-14 is left. I think this may be it! I tried!
so the answer is 2?
do you have answer choices?
Oh yeah!
I think so! Thats my guess!
OK, Jorge, this is very similar to the math question I asked you to post in mathematics a few moments ago...
But that is pretty much a biology question. well more like Chemistry
It's more of a chemistry question than math or biology. 1 half life: 100% ---> 50% 2nd half life: 50% ---> 25% 2 half lives.

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