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