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

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

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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.
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User Florian Mielke
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Answer:

innate immunity

Step-by-step explanation:

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User JohnP
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