What are the most likely sources of the methane gas detected in the Martian atmosphere by the Mars Express orbiter?
A) biological activity only
B) biological and/or volcanic activity
C) comet impacts only
D) volcanic activity only

Question

Quizplus · Accepted Answer

While the presence of methane in the Martian atmosphere could be a sign of biological activity, it is not the only possible explanation. Methane can also be produced by geological processes, such as volcanic activity or serpentinization of rocks. Therefore, the most likely sources of the methane detected by the Mars Express orbiter are biological and/or volcanic activity.

What Are the Most Likely Sources of the Methane Gas