Biology for IGCSE & O level - Diseases And Immunity (Section 4 - No. 39)
What is the primary function of the first line of defense in protecting against disease?
To produce antibodies.
To directly destroy pathogens.
To prevent pathogens from entering the body.
To engulf pathogens.
Explanation
The first line of defense's primary role is to block pathogens from entering.
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