CFC molecules are broken down in the
stratosphere by ultraviolet light to give highly reactive chlorine atoms. Then chlorine atoms react with ozone molecules. Last chlorine atoms are regenerated by this chain reaction so can react with
more ozone molecules.
Answer: Second one: one person refuses when the other asks to have sex.
Explanation: Abstinence is the act of knowingly not doing something for a purpose. The person refusing is trying to practice abstinence.
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Primary prevention aims to prevent disease or injury before it ever occurs
Secondary prevention aims to reduce the impact of a disease or injury that has already occurred.
Tertiary prevention aims to soften the impact of an ongoing illness or injury that has lasting effects.