On Cholesterol, Vitamin D, and UV, oh my! A Model for the Evolution of Human Races 1. Why are most levels of UV harmful/dangerous to humans (as well as other life forms)? 2. Why has some UV been essential (before modern times) for human life? 3. What does melanin do? 4. Where did humans arise? 5. Complete the chart below: Adequate Vitamin D Adequate protection from production? mutagenic UV rays? In Africa (UV intense) dark-skinned humans light-skinned humans In Europe (UV mod- mild) dark-skinned humans light-skinned humans + = yes; 0 = no View this ppt slideshow: http://campus.udayton.edu/~INSS/ThemeEvol/EvolTimeline.auto.ppt#1 6. Did the original Earth’s atmosphere contain oxygen? _____ How was our oxygen atmosphere formed? (Be specific: How? By whom?) 7. Microbial life in the oceans changed the very chemistry of Earth’s atmosphere. How did this change allow for terrestrial life to develop on this planet? Study the graph @: http://www.cpc.ncep.noaa.gov/products/stratosphere/polar/gif_files/ozone_hole_plot.png What changes have been occurring in the Earth’s atmosphere? How does it affect humans in Dayton, OH?
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