How is it that a 4yo kid and an 8yo kid look and behave so differently while a 21yo person might as well look and behave the same as someone who is 5-6 years older?
In: Biology
Also, it’s important for organisms to rapidly reach their full physical capability, so that they’re able to fend for themselves early on in case of danger. This is a higher priority than the improvement of cognitive ability, which in the case of humans can keep developing for decades after physical peak.
The real question is why do humans take so long to reach physical maturity? Probably because our civilization was good enough at protecting it’s youths and growth hormones didn’t need to be so strong
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