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Signs of Life on a Distant Planet? Why Scientists Are Cautious About K2-18b
Level 3
Question 1 of 5
Which restatement is most precise?
A
A tentative, three-sigma, disputed hint of DMS, below the conventional discovery threshold
B
A confirmed detection of life on K2-18b
C
A five-sigma discovery of ocean biology
D
A proven absence of any interesting chemistry
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