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It is highly doubtful that any wooden "trees", as we would recognize them, ever evolved on Mars. Likely the planet's environment was only suitable for very, very simple forms of life (if at all) before it became too harsh. AND, that would have been billions of years ago.
If you don't mind I would like to now you thoughts on the Hale crater...
Originally posted by weedwhacker
However, it's been suggested, and I tend to go with the opinions of those who do this for a career, that the denser atmosphere, and thus, the ability for water to remain liquid on the surface, went away, on Mars, VERY early in its history....it may have only been "viable" for complex lifeforms for about a billion years, or so...that leaves ~three billion, give or take, as a 'dead" planet.
Originally posted by spacekc929
even if there was some crazy stuff going on on Mars, ROV pictures would never show it. We will never see it unless we go there ourselves.