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In the blood vascular system of earthworm there are four pairs of hearts present in the first 13 segments. These are situated in the segments

A. 7th, 8 th, 9th and 10th

B. 8th, 10th, 12th and 15th

C. 8th, 9th, 12th and 13th

D. 7th, 9th, 12th and 13th

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