Ancient Evolution (image) The Earth Institute at Columbia University Share Print E-Mail Caption In a C4-dominated Australian landscape, Triodia pungens dominates hummock grassland, with scattered Acacia and Eucalyptus. Photo taken on the Mittebah Station in the Northern Territory. Credit Courtesy of Terrestrial Ecosystem Research Network Usage Restrictions Credit must be given. Share Print E-Mail 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.