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Jellies in the Class Hydrozoa are transparent and easily overlooked.
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Transparent sea jelly

 Many jellyfish in the class Hydrozoa, such as this hydromedusa Aglantha digitale,...
Ice divers study the abundance of marine life.
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Counting Creatures

 Ice divers use a quadrat to study the density of creatures living on the underside...
Marine biologist Gerald Kooyman of the Scripps Institution of Oceanography has documented climate-induced changes to emperor penguin habitats and impacts on how the penguins feed, breed, and raise their young.
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Emperor Penguins

 Scripps scientist Gerald Kooyman's expeditions have documented climate-induced...
Arctic cod have a special protein that warms their blood.
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Arctic Cod Under Ice

 Arctic cod have a special protein that keeps their blood from freezing in ice-cold...