All organisms require elements to live, grow and reproduce, but some of these are hard to find or take up. Nitrogen-fixing bacteria solve the problem by secreting compounds that allow them to acquire the metals they need.
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Duval, B., Hungate, B. Scavenging for scrap metal. Nature Geosci 1, 213–214 (2008). https://doi.org/10.1038/ngeo166
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DOI: https://doi.org/10.1038/ngeo166
