That’s a great question! I’m not an evolutionary biologist though I did study cellular and molecular biology a while back. Bacteria aren’t host-specific for the most part although of course we are most familiar with those that are because they’re the ones that cause most of the diseases we worry about. Assuming Martian microbial life has a means to respire and feed, it would likely be similar to the ways in which Earth bacteria and archaea accomplish these tasks, and so some varieties would likely have mechanisms that would cause our cellular structures harm.

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Allan Milne Lees

Allan Milne Lees

Anyone who enjoys my articles here on Medium may be interested in my books Why Democracy Failed and The Praying Ape, both available from Amazon.