Each is 'superior' in its own domain, its own environment. But if you want the earliest, and the most adaptable and survivable, it's bacteria. But humans can adapt their environment to themselves. Unwisely, humans are choosing to give up some of their adaptability. We waste most of our energy changing the temperature of our living spaces. We force hundreds of vaccines on our children, depriving their immune systems of exercise and the need to adapt. We refuse to exercise our muscles to the point of pathology. We even make our eyeglasses too strong, so our eyes don't even try to adjust in the appropriate direction. If we go extinct, we're to blame.
But much more so is the entitlement mentality. Give everyone food, water, shelter, and now even healthcare, whether they contribute to society or not. Also counter-evolutionary is the trend that intelligent, motivated, productive people tend to have fewer children than the weak and lazy. Chalk that up to the welfare state and also to culture. Some ethnicities don't value hard work, as did the Protestant work ethic, and subsist on minimum wage or welfare (in countries which give them that), but still bear lots of children. It's a very strong argument against the welfare and entitlement mentalities.