To keep warm, polar bears have a layer of_under their skin.

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Q: 25 (SSC/0)
To keep warm, polar bears have a layer of_under their skin.

question_subject: 

Science

question_exam: 

SSC

stats: 

0,10,2,2,10,0,0

keywords: 

{'polar bears': [1, 0, 0, 1], 'skin': [13, 1, 4, 4], 'hair': [5, 1, 2, 7], 'muscle': [4, 0, 0, 1], 'cartilage': [1, 0, 0, 0], 'layer': [4, 1, 3, 2]}