The Phanerozoic eon and the Paleozoic era began about ______________ million years ago.
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Q126: Lead that comes from radioactive decay is
Q127: Carbon dating was used to establish the
Q128: The Paleozoic era ended and the Mesozoic
Q129: Lack of knowledge of the phenomenon called
Q130: The Great Dying occurred at the end
Q132: Geologic evidence places Earth's age at _
Q133: _ dating is used specifically to establish
Q134: The periods of the Cenozoic era are
Q135: Primordial lead contains the isotope lead-_, whereas
Q136: An important radiometric dating process is the
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