Species go extinct because there are historical contraints built into a given body or a given design.
Kevin KellyThis is actually a very important principle that science is learning about large systems like evolution and that futurists are learning about anticipating human society: just because a future scenario is plausible doesn't mean we can get there from here.
Kevin KellyA single thread of self generation ties the cosmos, the bios, and the technos together into one creation. Humans are not the culmination of this trajectory but an intermediary, smack in the middle between the born and the made... The arc of complexity and open-ended creation in the last four billion years is nothing compared to what lies ahead.
Kevin Kelly