WE MUST REMEMBER, the pictures coming back from Mars are in color. This one is a close up photo of the ground, sent back by Curiosity Rover. It clearly show Green vegetation of moss or something like that. The bigger picture should soon be coming together for us. Most of us had some science in school. Green vegetation - chlorophyll - plants eat Carbon Di Oxide and produce Oxygen - I have found there are large areas of trees and vegetation on Mars - so there is no Oxygen on Mars?