An organism which thrives in extreme chemical or physical conditions which would be harmful to most life forms.

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What's the biggest obligate anaerobic organism discovered till now?

Beside many anaerobic single cell organisms, there are some annelid worms that are obligate anaerobic at least in their early development stages. Probably, due to low concentration levels in nature, ...
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Which are the most extreme artificial environments that lifeforms/ecosystems have adapted to?

I have heard of 'extremophiles', lifeforms that naturally thrive in all sorts of extreme environments. Is there any evidence to suggest that lifeforms are adapting to the extreme environments (such ...