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<p>timeline are thought to have driven the relative abundance of which form of nitrogenase was most common. Currently, there is no conclusive agreement on which form of nitrogenase arose first.</p>

<p><big>Microorganisms</big></p>
<p>Diazotrophs are widespread within domain <a href="page.php?w=Bacteria">Bacteria</a> including <a href="page.php?w=cyanobacteria">cyanobacteria</a> (e.g. the highly significant <a href="page.php?w=Trichodesmium">Trichodesmium</a> and <a href="page.php?w=Cyanothece">Cyanothece</a>), <a href="page.php?w=green_sulfur_bacteria">green sulfur bacteria</a>,</p><p>
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