there was lots of oxigen back then,and the plants can look like the ones we find on earth,but they might be made out of something else,as there is proof mars had oceans of water,plants,animals,but the atmosphere lacked a bit of co2 and the warmth left the planet turning it into a barren waste land,without co2,oxigen started thinning,plants dying,creatures dying becouse of decreased oxigen,UV particles boiling of water,the only remnant of water is at its poles
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