Which of the Following is NOT Used as a Biosignature

Question

Which of the following is NOT used as a biosignature?
A) metabolic activity
B) isotope ratios
C) microscopic imaging
D) mineral formations
E) microfossils

Accepted Answer

Microscopic imaging is not used as a biosignature. The other options (metabolic activity, isotope ratios, mineral formations, and microfossils) are all used as biosignatures to indicate signs of life.