Selenosis is a deficiency of selenium. What are the most common symptoms of selenosis?
A. shortness of breath
B. blotchy skin
C. brittle nails and hair
D. muscle cramps
Question 2
Which mineral has the ability to provide a protective barrier between teeth and the destructive acids that wear down enamel and contribute to dental caries?
A. fluoride
B. calcium
C. magnesium
D. phosphorus