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The life span of human W.B.C. is approximately

1. less than 10 days.
2. between 20 to 30 days.
3. between 2 to 3 months.
4. more than 4 months.

Correct answer: less than 10 days.

Solution

White blood cells generally have a short life span because they are rapidly produced and used in immune defense. Their average survival is usually under 10 days, making the shortest option correct.

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