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define the concept risk behaviour and explain why it is important for teenagers to investigate and be knowledgeable about it

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A risk behavior is a behavior that carries some form of risk. In the case of teenagers and health risk this can include habits that can be particularly dangerous toward their and other now and future health. protected sex for example is a risky behavior which could cause STD infections. 

Being knowledgeable about risk behaviors is a requirement in order to keep teens safe, and develop solutions to such dangers. 
a venture undertaken without regard for possible loss or injury,

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