I never learned much about evolution, so please do explain it like I’m 5
In: Biology
All this “random evolution” and can of paint thrown at a wall explanations seem to forget Carcinification and similar phenomena.
With the same environment, evolution (which isn’t RANDOM at all btw), tends to find the same best solutions.
The answer to OP is that the environment changed so much, so fast, and for such a long period of time, that the solutions found by dinosaurs evolution were not good anymore.
Lack of food and light favoured smaller, warm-blooded animals, for an extended period of time. Eventually the filled the gaps left by dinosaurs and even if conditions turned back to the original, food abundance and light, which favoured the dinosaurs, the survivors of what they once were couldn’t compete with other animals that had taken their ecosystem niches anymore.
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