The Figure Below Is a Photograph of the Surface of Mars.In

Multiple Choice

The figure below is a photograph of the surface of Mars.In this image, we see rounded bits of gravel, which are evidence for

A) tectonic activity.
B) intelligent life-forms having ground down the rocks.
C) bacterial life having once lived in the surface of the gravel particles.
D) liquid having flowed on the surface in the past.
E) intense winds that could only occur in a thicker atmosphere.