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They were shapes in a Martian rock that fell on Antarctica that could have been fossilised bacteria. I don't think they ever established whether they were fossils or ordinary mineralisationa.
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Read my last post. They looked like fossils but ended up being an artifact of the processing of samples.
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Also nate, are you sure about that? I thought they'd found very primitive, slug-like or mollusc-like lifeforms on Mars. But since I can't actually find my source while you can, I'll assume yours is more reliable. I really could do with some reliable sources for this discussion.
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Yes, I'm sure. If there had been anything beyond single-cell organism it would be big news and everyone would know.