Reproductive Effort Question (IMAGE) Smithsonian Tropical Research Institute Caption Helene Muller-Landau's new model explaining the relationship between stressful environments and seed size helps to answer questions about how life's diversity arises and is maintained. Credit STRI Usage Restrictions credit STRI 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.