Which line on the graph represents the radioactive decay of an isotope?
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100%✔ 50%25%10%
20 seconds25 seconds30 seconds50 seconds
471325
2 3 4 5
Arianna finds some fossil bones while digging in her backyard. Could they be dinosaur bones? Using carbon dating, she determines that 3% of the original radioactive carbon-14 is still radioactive. (The rest has decayed to nitrogen-14.)
17,19022,920✔ 28,65034,380
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