Oversimplified question to save space and catch your attention.
Here's the news: Mars once flowed with WATER! That means they had a stable atmospher that sustained organisims (probably micro). Our atmospher was, in part, created by similar organisms.
So while earch was still forming or sometime after, do you think life from the Mars seeded the Earth?
BTW do you know how our atmospher was created?
http://news.aol.com/story/_a/images-suggest-water-once-covered-mars/20080716151009990001?icid=200100397x1205912205x1200296148
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