Race & Racism

3. the evolution of this trait tasked us with the problem of staying cool
8. these UV rays can't penetrate the ozone layer
10. an increase in the number of these glands helped humans stay cool as they evolved into bipedal organisms
11. melanin helps us chemically neutralize these molecules after damage by UV exposure
12. a factor that modified the genetic composition of humans and led to genetic exchange between local populations
13. a human adaptation that was a result of bipedalism and that helped cool us but also led to the evolution of different skin tones

1. a group of populations sharing certain biological traits that distinguish them from other groups of populations
2. cells that produce melanin
4. a molecule that protects us from the harmful effects of ultraviolet rays
5. a disease that may develop due to inadequate vitamin D exposure in young children
6. these UV rays destroy folate
7. these UV rays are beneficial to us because they help us make melanin
9. a disease that can develop in individuals with lighter skin if they move to another region with greater exposure to UV rays that they are genetically not adapted to
11. a molecule essential for synthesizing DNA in cells undergoing division