1) What is considered the first line of defense? a) Chemokines and Cytokines b) Chemical and Physical Barriers c) Gram + and Gram - Bacteria d) Phagocytosis 2)  Which immune cells poke a hole in pathogens? a) Dendritic cells b) Natural Killing cells c) B Cells d) Macrophages 3) Which immune cells engulf and digest pathogens? a) B Cells b) T Cells c) Macrophages d) Platelets

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