Figure (IMAGE) Osaka University Caption Genetically identical Daphnia magna changes sex in response to environmental stimuli. The female on the right has eggs, while the male on the left does not. Credit Yasuhiko Kato Usage Restrictions Credit must be given to the creator. License CC BY 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.