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What is your body’s last and most complicated line of defense against infection?.
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What is your body’s last and most complicated line of defense against infection?.

User Stephen Melrose
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Answer: The third line of defense are things like anti-bodies and lymphocytes.

Step-by-step explanation:

Antigen-specific immune responses specifically target and attack invaders that get past the first and second line of defense.

User Phortx
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