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The Martian regolith is known to contain a maximum of 0.5% (w/v) perchlorate (ClO 4 −) that is toxic for most living organisms, [78] but since they drastically lower the freezing point of water and a few extremophiles can use it as an energy source (see Perchlorates - Biology) and grow at concentrations of up to 30% (w/v) sodium perchlorate ...