Tardigrades
Phylum Tardigrada
Eight-legged micro-animals, typically 0.3–0.5 mm. Found in moss, lichen, marine sediment, and essentially everywhere else. In the tun state — a desiccated, metabolically arrested form — they withstand vacuum, 6,000 atmospheres of pressure, doses of radiation lethal to most animals, and decades without water. Rehydration restores normal function within hours.
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