Crossword Genius

Two-million-year-old discovery in 2022 in the frozen soil of Greenland (3)

Ross

I believe the answer is:

dna

(Other definitions for dna that I've seen before include "Genetic material often used by police" , "Genetic code" , "Initially, it stores genetic information" , "Briefly, substance in chromosomes used by police to identify criminals" , "Main constituent of chromosomes" .)

I've seen this clue in The New York Times.
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