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Which of these elements was NOT a focus of John Martin's research?

  • Iron

  • Zinc

  • Copper

  • Oxygen

Answer

The focus of John Martin's research was on iron, the limiting nutrient for phytoplankton growth in the ocean. Therefore, oxygen was not a focus of his research. Iron is essential for photosynthesis, and its availability can limit the growth of phytoplankton, which are microscopic plants that form the base of the marine food chain.
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