Multiple choice general knowledge

There are more than __ bacteria on each square inch of man's skin.

  1. 1 million

  2. 5 million

  3. 20 million

  4. 25 million
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Human skin supports millions of bacteria per square inch as part of the normal microbiome, with 20 million representing a commonly cited estimate. This dense microbial population includes commensal and beneficial species. The actual count varies by body site and individual.

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