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OpenStudy (daniyil_the_spy):
This is health.
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OpenStudy (daniyil_the_spy):
Which acts as both a physical and chemical barrier against pathogens?
OpenStudy (daniyil_the_spy):
A. blood B. mucus C. lymph D. skin
OpenStudy (tkhunny):
Barrier...barrier Which of those is a barrier? There's only one. The rest are transportation. What is this, no-one-is-doing-math night?
OpenStudy (daniyil_the_spy):
|dw:1481857648022:dw| @tkhunny
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