Which of the following is a chemical barrier that is able to destroy the cell walls of certain harmful bacteria? a. mucus membranes b. skin c. white blood cells d. enzymes in tears

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Karen is waiting by the lockers before school for her friend richard. they had agreed to look over the history review sheet together to be ready for the test later that day. richard shows up late with uncombed hair and wrinkled clothes. karen: "you're five minutes late and you look like a wreck! " richard: (slams his locker) "you know, i don't have time for this." karen: "fine! figure out the test on your own! "

In a short paragraph, explain how the barriers you described in part a can lead to long term consequences related to risk behaviors and negative health outcomes for young people?