MCQ Solution: Animal Kingdom
In the blood vascular sysrtem of Earthworm there are four pairs of hearts present in the first 13 segments. These are situated in segments
1. 7th.8th,9th and 10th
2. 9th, 10th, 12th and 13th
3. 8th, 9th, 12th and 13th
4. 7th, 9th, 12th and 13th
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