A) 8 (four pairs)
B) 2 (one pair)
C) 6 (three pairs)
D) 12 (six pairs)
Correct Answer: A
Solution :
In each of the segments, 7, 9, 12 and 13 of earthworm a pair of, large, thick, rhythmically, contractile vertical vessels called hearts are present i. e., four pairs of hearts are present. I
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