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1. inborn

2. active acquired

a. natural

b. artificial

3. passive acquired

a. natural

b. artificial

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14y ago
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11y ago

Tears, saliva, skin, mucous

membranes, and stomach acid

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13y ago

The five barriersd of the immune system are the skin, stomach acids, mucous membranes, salivary glands, and tears.

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12y ago

tears

mucous

saliva

skin

stomach acid

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11y ago

eat your greens, drink your milk and do your exercise. i dont know any more

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Q: What are 5 protective barriers of the immune system?
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