What region of the country has the highest percentages of the ...

[erika]

What region of the country has the highest percentages of the population who are Asians, Latinos, and Native Americans?
 a. Northeast
 b. Midwest
 c. South
 d. West
 e. Northwest

Question 2

Describe the factors that may interfere with vitamin D synthesis.

[meganlapinski]

Answer to Question 1

d

Answer to Question 2

Latitude, season, and time of day all have dramatic effects on vitamin D synthesis and status. Heavy cloud cover, smoke, or smog blocks the ultraviolet (UV) rays of the sun that promote vitamin D synthesis. Differences in skin pigmentation, latitude, and smog may account for the finding that African Americans, especially those in northern, smoggy cities, are most likely to be vitamin D deficient and develop rickets. Vitamin D deficiency is especially prevalent in the winter and in the Arctic and Antarctic regions of the world. To ensure an adequate vitamin D status, supplements may be needed. The body's vitamin D supplies from summer synthesis alone are insufficient to meet winter needs.