Section 1 (Easy) | Q3 of 10
For each blank select one entry from the corresponding column of choices. Fill all blanks in the way that best completes the text.
The (i)_____ of molecular oxygen on Earth-sized planets around other stars in the universe would not be (ii)_____ sign of life: molecular oxygen can be a signature of photosynthesis (a biotic process) or merely of the rapid escape of water from the upper reaches of a planetary atmosphere (an abiotic process).
Blank (i)
dearth
presumption
detection
Blank (ii)
a controversial
an unambiguous
a possible
Select one entry from each column.