Researchers have found that smiling is something: 1. we learn to do as babies. 2. we learn to do in childhood. 3. that means different things in different countries. 4. that is innate; we don't learn to smile, we just do it.

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.

false

true

true

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true

jefferson hoped to establish trade with the native american people of the west and find a water route to the pacific. jefferson also was fascinated by the prospect of what could be learned about the geography of the west, the lives and languages of the native americans, the plants and animals, the soil, the rocks, the weather, and how they differed from those in the east.

a: social security and social programs