Early Life on Earth Utilized Scarce Molybdenum

New research sheds light on the utilization of molybdenum (Mo) by early life forms on Earth, despite its scarcity. Molybdenum is a critical element in enzymes that drive essential metabolic reactions. The study, published in Nature Communications, challenges previous assumptions that molybdenum's scarcity limited its use by early organisms. Researchers tracked molybdenum's abundance throughout Earth's history and its use by organisms across the tree of life. They found that ancient microbes utilized molybdenum dating back 3.7-3.1 billion years ago, well before the Great Oxidation Event. This suggests that early life adapted to use molybdenum even when it was present in smaller amounts. Hydrothermal vents are identified as early sources of molybdenum and other metals, such as iron, zinc, manganese, and tungsten. These findings have implications for astrobiology, suggesting that life may be possible in environments with limited resources, such as ocean worlds with hydrothermal vents. This research highlights the adaptability of early life and expands the range of environments considered potentially habitable.

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