Which among the following living being has respiratory organ but does not have brain ?

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Q: 10 (SSC/NA)
Which among the following living being has respiratory organ but does not have brain ?
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question_subject: 

Science

question_exam: 

SSC

stats: 

0,16,30,13,16,11,6

keywords: 

{'respiratory organ': [2, 0, 1, 0], 'crab': [1, 0, 0, 0], 'brain': [1, 0, 0, 1], 'blood succor': [1, 0, 0, 0]}