Biology for IGCSE & O level - Diseases And Immunity (Section 4 - No. 19)
What is the role of the first line of defense in protecting the body against disease?
To produce antibodies.
To destroy pathogens directly.
To prevent pathogens from entering the body.
To engulf pathogens.
Explanation
The first line of defense acts as a barrier to prevent pathogens from entering.
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