A few years ago, I made a hike into the Burgess Shale in British Columbia. The site contains fossils of pre-Cambrian life forms, many of which barely saw the light of day before fading into extinction. The most unusual of these early animals were asymmetrical, having three and sometimes five appendages, which, I suppose, might explain why these animals didn’t make it to the Cambrian era and beyond. It seems unlikely they’d have been able to compete well in a gravitational environment and it appears they were naturally de-selected in favor of the mobile superiority of bi- and quadrupedal life. I guess it will always be the case that some life forms will be naturally de-selected for an inability to adapt in a hostile and competitive world.
Given our difficulties dealing with our current dilemmas (i.e. dreaded virus, nuclear arms proliferation, political alienation, et. al.) I’m just wondering how close humanity may be getting to the top of the de-selection list.