Earth-based microorganisms will not live in a
Wikipedia has an article on the atmosphere of
Mars, which is mostly carbon dioxide. Also, Mars
has almost no atmosphere, as compared with earth.
If Earth's atmosphere is 100%, then Mars'
atmosphere is only 0.6% - less than 1% as much
atmosphere as earth. Here's the article:
No life has been found on Mars, according to
almost all of the scientists who know about Mars.
Here's what Wikipedia says:
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