Which of the following pairs has open type of circulatory system?

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Q: 75 (SSC/NA)

Which of the following pairs has open type of circulatory system?
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question_subject: 

Science

question_exam: 

SSC

stats: 

0,9,24,14,5,9,5

keywords: 

{'circulatory system': [1, 0, 1, 0], 'earthworm': [4, 0, 1, 0], 'silverfish': [3, 0, 0, 2], 'fish': [1, 2, 0, 0], 'tadpole larva': [1, 0, 0, 0], 'open type': [1, 0, 0, 0], 'whale': [1, 0, 1, 0], 'cockroach': [2, 0, 0, 0], 'leech': [1, 0, 0, 0]}