Some many chances for early life to have hung on, delayed change, stalled evolution. These early organisms hung on for 100's of millions of years, dominating an

Some many chances for early life to have hung on, delayed change, stalled evolution. These early organisms hung on for 100's of millions of years, dominating and out-competing later forms until gradually they were in turn out-competed. Same with Dinosaurs! They dominated for 200M years. But for a chance asteroid we could still be a planet of dinosaurs. No sign of them giving up in the fossil record. We find other planets with life, likely will be stalled in one of these cul-de-sacs. Our own existance can be explained by observer's paradox - we didn't get stalled which is why we're here which is why we can wonder about these things!