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What is your evidence? This can be in bulleted points. can you help I don't now how to explain it.
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What is your evidence? This can be in bulleted points.

can you help I don't now how to explain it.

What is your evidence? This can be in bulleted points. can you help I don't now how-example-1
User Osahyoun
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a ratio of non-radiogenic 'stable isotopes', stable radiogenic isotopes, or unstable radioactive isotopes of particular elements in an investigated material.
User Electricsheep
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