Biology for IGCSE & O level - Diseases And Immunity (Section 1 - No. 15)
What are the first lines of defense against pathogens?
Antibodies and phagocytes.
Skin, mucus membranes, and stomach acid.
Lymphocytes and memory cells.
Vaccines and antibiotics.
Explanation
Skin, mucus membranes, and stomach acid are the first lines of defense.
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