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.

The centers for*blank* control and prevention safeguards americans from health, safety, and security hazards and threats.

Isabel wants to sign up with the online social network teenbook, which she heard about from her friends at school. the teenbook site asked isabel for some personal information to complete her registration. in addition to her full name, teenbook asked for the name of her school, the city where she lives, her age, and her favorite foods. what is the only information that isabel should give to best ensure her safety?

Which of these drugs can be approved for medicinal purposes in a limited capacity? a) marijuana b) tobacco c) alcohol d)caffeine