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likoan [24]
3 years ago
15

What is the immune systems first line of defense against invading pathogens

Biology
1 answer:
GREYUIT [131]3 years ago
8 0
The first line of defense, <span>includes physical and chemical barriers. These include your skin, tears, mucus, cilia, stomach acid, urine flow, bacteria and white blood cells called necrophiliacs.</span>
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