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

User Bragolgirith
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The first line of defense, includes physical and chemical barriers. These include your skin, tears, mucus, cilia, stomach acid, urine flow, bacteria and white blood cells called necrophiliacs.
User Florian Mielke
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Answer:

innate immunity

Step-by-step explanation:

User JohnP
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