Sample Collection (IMAGE) Bigelow Laboratory for Ocean Sciences Caption Scientists collect samples in Death Valley National Park. The researchers analyzed thousands of microbial genomes and discovered that two abundant groups produce energy using ancient methods that may predate the evolution of respiration. Credit Ramunas Stepanauskas Usage Restrictions Photo credit required. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.