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Extremophile bacteria and archea are living very deep beyond our imaginations. This is what you need for general composition at different depths. And this and this is for the deepest living organism known ! Following is image from (Manson et al 2010) which shows at what depth you will get bacteria Even more deeper, Wold's single species ecosystem, ...


First of all we must consider what the substrate is at 30 meters and deeper, either clay, anaerobic, impermeable or permeable substrates, everywhere that you find liquid water between 0-100 degrees you find life (Geogemma barossii reproduces at 120'C 250'F), even if the peak of everest is mostly under zero and has 270kph winds, algae grows there. Plant ...

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