Biology for IGCSE & O level - Diseases And Immunity (Section 1 - No. 33) | ExamPlay

Biology for IGCSE & O level - Diseases And Immunity (Section 1 - No. 33)

Which of the following are considered chemical barriers against pathogens?

The skin

Tears

Stomach acid

Mucus

Explanation

Stomach acid is a chemical barrier.

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