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I'm on holiday http://www.colegiosanfelix.com/index.php/cheap-doxycycline doxycycline hyclate cost walmart That high iron ratio has profound implications. Iron is a critical element for ocean life and is known to spur the growth of phytoplankton in many marine habitats, especially those important in the ocean’s carbon cycle. This, in turn, impacts atmospheric carbon dioxide levels and thus Earth’s climate. Over half the planet’s seafloor ridges are slow-spreading, meaning the team’s discovery indicates there may be far more iron in these locations than previously estimated.