Aloe vera (IMAGE) Smithsonian Tropical Research Institute Caption Many species from hot semi-arid areas, such as succulent plants, have evolved a form of drought-resistant photosynthesis mechanism that reduces water loss. Credit Jorge Aleman/Smithsonian Tropical Research Institute Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. License CC BY-NC 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.