Multiple choice general knowledge science & technology

What causes fingerprints to be left behind when we touch things?

  1. The natural oils in the skin

  2. The dust on the things we touch

  3. The moisture in the atmosphere

  4. The smoothness of the surfaces we touch

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Fingerprints are left behind due to natural secretions on our skin. Sweat glands produce moisture, and sebaceous glands produce oils. When we touch objects, these substances transfer to the surface, creating the impression that constitutes a fingerprint.