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1. 
The greater the latitude, the _______ intensity of the UV radiation.
A.
Higher
B.
Lower
C.
Equal
D.
Depends on the weather
2. 
UV radiation varies with latitude due to _______
A.
Human skin color
B.
Closeness with the sun
C.
Angle of the solar rays
D.
Weather of each region
3. 
Pigment that gives its color to the human skin
A.
Melanin
B.
Melanocyte
C.
Folate
D.
Vitamin D
4. 
The clearer the human skin, the ________ its reflectance.
A.
Depends on the country
B.
Equal
C.
Higher
D.
Lower
5. 
The risk of skin cancer is not a selective pressure of skin color because this disease occurs ______ of reproductive age
A.
After
B.
Before
C.
During
6. 
In evolution, _________ pressure is any cause that reduces the reproductive success of a population
A.
Atmospheric
B.
Selective
C.
Social
D.
Natural
7. 
Eumelanin is responsible for a _____ coloration
A.
Albino
B.
Red- Yellow
C.
Black or Brown
D.
Its not related
8. 
Pheomelanin is responsible for a _____ coloration
A.
Albino
B.
Red - Yellow
C.
Black or Brown
D.
Its not related
9. 
With intense exposure to the sun, folate level _________
A.
Its not related
B.
Stays the same
C.
Increases
D.
Decreases
10. 
When living in high latitudes (for example, Canada) which population is less likely to synthesize an adequate level of vitamin D
A.
Light skin
B.
Very dark skin
C.
Light brown skin
D.
Dark brown skin
11. 
Currently the concept of race has a _______ foundation
A.
Biologic
B.
Cultural
C.
Evolutionary
D.
Depends on each person
12. 
Currently scientists prefer to talk about human ______ with certain characteristics than races.
A.
Tribes
B.
Categories
C.
Species
D.
Populations