Multiple choice

Why are polar bears almost undetectable to infrared cameras?

  1. nobody looks for them

  2. their fur is almost transparent

  3. they give off no heat

  4. they are very detectable
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Polar bear fur is composed of hollow, transparent hairs that do not emit heat in the same way as solid fur, effectively trapping body heat and making the bear nearly invisible to infrared cameras that detect thermal radiation.

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