Stop the nonsense. Can you give an example when a more complex organism has supplanted a less complex one? And I can do the opposite – dinosaurs died in the fall of a meteorite, and bacteria and the simplest survived. From an evolutionary point of view, this is nonsense. So much time of evolution and selection, increased the chances, suppressed the suppressed - and all died together from some meteorite! The eruption of a volcano or something else. Why do we need a mechanism that doesn’t work?
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To be honest, I can hardly imagine how it is possible not to understand the most obvious things. You are like those Americans who write on the microwave: “Don’t cuddle pets.” Likewise, the cat, and from some microwave died... It is all the producer's fault, the villain, did not take into account such a possibility.
Evolution is the same producer. The dinosaurs were well designed and lived well in the existing conditions. Meteorites are not predicted. Not even the meteorites themselves, but the subsequent sharp climate change. As a result, the conditions were created that the creatures suddenly found themselves placed in a medium not intended for them. Why they died. If the atmosphere suddenly ceases to contain oxygen, we will also die. All of. But after some time (a billion years) there will be some water- or new-atmosphere-breathing intelligents who have evolved from the simplest. Well, if there is no cataclysm with them either.