Which of the following statements is true?
a. spf 10 is the minimum for safe protection...
Which of the following statements is true?
a. spf 10 is the minimum for safe protection from the sun.
b. from 10am to 4pm are the most dangerous hours for exposure to the sun.
c. we need vitamin d from the sun so there is no unsafe exposure level.
d. there is only one kind of harmful uv ray from the sun.
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