One place that astronomers think might have had life start long ago is Mars. Which of the following is not a discovery that we have made on Mars so far?
A) observing what looks like dried up river channels from orbiting spacecraft
B) the discovery of organic materials (the chemical building blocks of life, such as amino acids) by spacecraft that have landed
C) the discovery that Mars long ago had plenty of flowing water, from the composition and layering of some of the rocks examined by Mars rovers
D) the discovery of mudstone on Mars, which indicates that ancient Mars may have been more habitable than Mars today
E) the discovery of significant amounts of frozen water on Mars, under the surface

Question

Quizplus · Accepted Answer

While we have found evidence indicating that Mars may have had the conditions necessary for life to start (such as dried up river channels, evidence of flowing water, mudstone, and frozen water), we have not yet discovered organic materials on Mars. However, there have been ongoing investigations into the possibility of finding organic materials on Mars, particularly with the upcoming Mars 2020 mission that will collect rock samples to potentially bring back to Earth for analysis.

One Place That Astronomers Think Might Have Had Life Start