It’s much easier to be born knowing how to cope in life. Learning takes up many resources. A brain the size of a human’s is metabolically expensive and inefficient. Resources have to be plentiful to supply the needs of one human compared with other animals, and humans can only survive long-term in groups. Others who rely on learning exist, but one brain will compete and beat out another when resources are scarce. Right now humans are the victors with a population of 8 billion, but once they exhaust resources, it’s the less costly animals who will carry on.
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