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

User Deasserted
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Answer: The immune system (immune system/immunity).

Explanation: The immune system is a network of organs, cells and proteins that defends the body against infection, whilst protecting the body's own cells. The immune system keeps a record of every germ (microbe). 'VACCINES EXPLAINER' (JPG.) DOWN BELOW:

What is your body’s last and most complicated line of defense against infection?.-example-1
User Seburdis
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