Why is Picrophilus considered one of the most acid-tolerant organisms?

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archaea — Archaea Archaea are found in a diverse range of extreme environments, including the salt deposits on the shores of the Dead Sea.

Picrophilus is recognized as one of the most acid-tolerant organisms known because it is capable of growth at a pH of approximately 0. These archaea were originally isolated from acidic soils in Japan and are classified as extremophiles, a group of microorganisms that thrive in environments that would be lethal to most other forms of life.1