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simply--steve simply--steve
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Posts: 700
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6 years ago
Polar bears have black skin. This characteristic helps them deal with cold stress by
 a. increasing the amount of air trapped next to the skin.
  b. increasing the absorption of radiant energy from the sun.
  c. increasing the insulation provided by subcutaneous fat.
  d. reducing heat loss by restricting blood flow to the skin.
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6 years ago
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