What is the primary element Martin believed could limit ocean productivity?
Carbon
Iron
Nitrogen
Oxygen
Answer
Iron is the primary element that limits ocean productivity. This is because iron is an essential micronutrient for phytoplankton, the microscopic organisms that form the base of the marine food chain. Without sufficient iron, phytoplankton cannot photosynthesize and grow, which in turn limits the growth of other marine organisms that feed on them.
Exploring the Depths: The John Martin Quiz
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