 Life on Earth has evolved to use nitrogenase as a way to convert nitrogen gas into ammonia, which can then be used as a source of energy. This process is essential for the survival of many organisms, including humans. Scientists have discovered that nitrogenase is an ancient protein structure that has remained unchanged since its origin over 3 billion years ago. They have also found that this protein structure is present in all living organisms today. Suggesting that it was likely inherited from our earliest ancestor. This article was authored by Amanda K. Garcia, Derek F. Harris, Alex J. Rivier, and others.