If you performed a $\delta$¹³C isotope analysis on an unknown geological sample and determined a negative $\delta$¹³C % value, would you conclude that life had existed or not in that sample and why?

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The Answer of If you performed a $\delta$¹³C isotope analysis on an unknown geological sample and determined a negative $\delta$¹³C % value, would you conclude that life had existed or not in that sample and why?

If You Performed A δ\deltaδ 13C Isotope Analysis on an Unknown Geological Sample and an Unknown

If You Performed A $\delta$ ¹³C Isotope Analysis on an Unknown Geological Sample and an Unknown