Huh, so ectobiology is a means by which it is not only ensued that there would be at least ONE session born from an appointed species, but also that the game (reproductive method) would have a chance to spread along the timeline so there would be as many sessions as possible (like with frogs lying many eggs with most of them being eaten by predators or just dying)

Nnnot really? Ectobiology is just the science of creating something as a clone of itself, that will be then sent back in time to become that same something. It is mentioned that most SBURB Sessions are doomed to fail, just like how animals lay many eggs because a lot of them will just not survive, implying there’s a lot of them at once- However, the only example we have of the Sessions being wide-spread is Beta Earth. Alpha Earth, Alternia and Beforus had only a single Session each.