Is life possible in mars?

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for years scientist have said that there is no life possible on mars.no water,completely devoid of life.in the past 2 years,they now say there is methane in the atmosphere which is a byproduct of life or volcanic activity and recently they have found water rising from the surface.science facts mars goes green in the maritian spring.are we being lied to about possible life on mars? what you think..?