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Mathematics 11 Online
OpenStudy (daniyil_the_spy):

This is health.

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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