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Due to system maintenance, CK-12 will be unavailable on Friday,8/19/2016 from 6:00p.m to 10:00p.m. PT.

Barriers to Pathogens

Your body uses chemical and physical barriers as a first defense against infection.

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Teacher Contributed
To stimulate the critical thinking skills required to assess the validity of statements about the key concept using an Agree/Disagree Table.
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