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The First line of defense in the immune system A( block pathogens from entering block B( KIll infected cells C( Send signals to increase immune cell formation D( kill the pathogen
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The First line of defense in the immune system

A( block pathogens from entering block
B( KIll infected cells
C( Send signals to increase immune cell formation
D( kill the pathogen

User Mickburkejnr
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1 Answer

3 votes
I think it’s A blocking pathogen from entering block
User Hang Chen
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