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Algebra 9 Online
OpenStudy (anonymous):

Period Number of Years Ago Jurassic 2.08 ⋅ 10^8 Silurian 4.38 ⋅ 10^8 Tertiary 6.64 ⋅ 10^7 Triassic 2.45 ⋅ 10^8 Order the time periods from oldest to youngest.

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