Final answer:
The evidence about the type of rock found near the channel on Mars supports the claim that flowing water formed the channel on Mars.
Step-by-step explanation:
The evidence about the type of rock found near the channel on Mars best supports the claim that flowing water formed the channel on Mars. Geological features such as ancient watercourses and smaller gullies suggest the presence of liquid water in the past and intermittent outbreaks of water even today. The sedimentary rocks found by the rovers contain chemical evidence of evaporation and small spheres rich in hematite, indicating the presence of water in watery environments.