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The analysis of the ________________ of elements in meteorites located by scientists convinced astronomers that the origin of the solar system can be traced back to 4.6 billion years ago.
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The analysis of the ________________ of elements in meteorites located by scientists convinced astronomers that the origin of the solar system can be traced back to 4.6 billion years ago.

User Sridhar
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isotopes is the word you are looking for.
User Celebes
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