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Perchlorate (ClO4−) and chlorate (ClO3−) are ubiquitous on Earth and ClO4− has also been found on Mars. These species can play important roles in geochemical processes such as oxidation of organic matter and as biological electron acceptors, and are also indicators of important photochemical reactions involving oxyanions; on Mars they could be relevant for human habitability both in terms of in situ...
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