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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asked May 27, 2022 55.8k views

19 votes

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

Biology
college

Mickburkejnr asked

by Mickburkejnr

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1 Answer

3 votes

I think it’s A blocking pathogen from entering block

Hang Chen answered Jun 1, 2022

by Hang Chen

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