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Researchers are pairing chemical analyses with micropaleontology-the study of tiny fossilized organisms-to better understand how global marine life was affected by a rapid warming event more than 55 million years ago. Scientists have begun working with iodate, a type of iodine that exists only in oxygenated waters. By analyzing the iodine-to-calcium ratios in microfossils, they are able to estimate the oxygen levels of ambient seawater, where microorganisms once lived. [Source: EurekaAlert!]
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