Among the following sets of salient features, which set does not exclusively characterize mammals?

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Q: 95 (SSC/NA)
Among the following sets of salient features, which set does not exclusively characterize mammals?
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question_subject: 

Science

question_exam: 

SSC

stats: 

0,2,11,7,2,2,2

keywords: 

{'mammals': [2, 0, 2, 2], 'salient features': [1, 0, 0, 0], 'sweat glands': [1, 0, 0, 0], 'mammary glands': [1, 0, 0, 0], 'sets': [4, 3, 5, 2], 'hairs': [2, 0, 1, 1], 'skin': [13, 1, 4, 4], 'presence': [5, 1, 0, 1]}