As pаrt оf the spаce prоgrаm, an alien life fоrm (ALF) has been discovered. You grow cells in media containing N14 (light nitrogen) for a few generations and then switch the cells to media containing N15 (heavy nitrogen) (reproducing the Meselson Stahl experiment but starting with N14 and then switching to N15 for 2 generations) and much to your surprise, you find the ALF has conservative DNA replication!! Which of the following outcomes is consistent with your conclusion?