If they are unable to extract enough oxygen from the water around them, fish can "drown." Technically, the process that occurs is closer to suffocating, since most fish have gills instead of lungs.

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What Lies Within? New Image From a Mysterious Galaxy Asks Big Questions

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A detailed image reveals an unusual plasma jet structure, suggesting the presence of two merging supermassive black holes at the galaxy’s core. For more than a century and a half, the distant galaxy OJ 287, located five billion light years from Earth, has intrigued scientists with its unusual changes in brightness. Astronomers have long suspected [...] http://dlvr.it/TNNzff
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