Researchers have found that smiling is something: 1. we learn to do as babies. 2. we learn to do in childhood. 3. that means dif
ferent things in different countries. 4. that is innate; we don't learn to smile, we just do it.
1 answer:
4 - That it it innate; we don't learn to smile, we just do it.
Smiling is produced when neuronal signals are transmitted to the facial muscles whenever endorphins are produced.
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