Origins of life (Figure 1) (IMAGE) Nagoya University Caption Some scientists think that XNA evolved into RNA, which then evolved into DNA, forming the very beginnings of life. Credit Keiji Murayama Usage Restrictions None 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.