Which among the following helps in circulation of blood ?

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Q: 1 (SSC/NA)
Which among the following helps in circulation of blood ?
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question_subject: 

Science

question_exam: 

SSC

stats: 

0,51,49,17,51,14,18

keywords: 

{'blood platelets': [2, 0, 0, 0], 'monocytes': [4, 0, 0, 1], 'circulation': [0, 0, 0, 1], 'lymphocytes': [1, 0, 0, 0], 'blood': [5, 0, 0, 1], 'arithrocytus': [1, 0, 0, 0]}