Final answer:
Sebum protects the skin from dehydration and invading microbes by acting as a barrier.
Explanation:
Sebum, an oily substance secreted by sebaceous glands, protects the skin from dehydration by acting as a barrier against water loss. It also lubricates and protects the skin from invading microbes, helping to maintain its health and integrity.
Learn more about Skin Protection here:
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