Can Superman and Supergirl populate an entire new generation of Kryptonians and eventually a planet like Krypton-I, or something? Why not? So the questions are:
(a) Can they biologically produce more superkids.
(b) If (a) is true, will they be on earth or they will colonize other planet? (like moon then rename it to Krypton-I or something) whether they are able to foster an entire generation.