In Leech, the male and female genital apertures are located respectively in the—
1). 7th and 8th segment
2). 10th and 11th segment
3). 13th and 14th segment
4). 18th and 21st segment
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1. The exchange of materials between blood and interstitial fluid occurs only at the
3. Which among the following salt can be used as a food preservative for pickles?
4. The gas which is mainly responsible for the greenhouse effect is:
5. The snow on the mountains does NOT melt all at once when it is heated by the sun because: