Assertion: melanin's part | /r/HasProperty | exposed to sun
Facets:
Source sentences:
text: Certain parts of the US are exposed to sun strong enough to produce good quantities of vitamin D year-round (e.g. Miami) while places like New York do not get strong enough sun for about four months (November to February).
text: People with naturally darker skin have more melanin pigment in their skin than people with white as a natural result of evolution, because some parts of the world exposed to the sun more than the other parts of the world.