Male rat | Female rat |
1. Larger in size | Smaller in size |
2. Nipples are degenerate | 6 pairs, fully functional, 3 pairs in thorax and 3 pairs in abdomen |
3. Scrotal sacs present | Absent |
4. Penis present | Absent |
5. Vulva absent | Present |
6. Urethral opening at the tip of the penis is common opening for the passage of the sperms and urine | Separate opening in front of vulva |
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