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Ray Of Light [21]
3 years ago
6

List 2 examples of a human's first line of defense:

Biology
1 answer:
Verizon [17]3 years ago
5 0

Answer:

The first line of defence (or outside defence system) includes physical and chemical barriers that are always ready and prepared to defend the body from infection. These include your skin, tears, mucus, cilia, stomach acid, urine flow, 'friendly' bacteria and white blood cells called neutrophils.

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Romashka-Z-Leto [24]
The correct answer is (b.) an increase in the width of the stem. The increase in the width of the stem could be referred to as the secondary growth of the stem. Whereas the primary growth is the upward growth of the plant. 
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\huge\boxed{Protein}

Explanation:

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Hope this helped!

<h2>~AnonymousHelper1807</h2>
7 0
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Cells a and b are the same size and shape, but cell a is metabolically quiet and cell b is actively consuming oxygen. Oxygen wil
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