Encyclopedia > 4000 BC

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5th millennium BC

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(6th millennium BC - 5th millennium BC - 4th millennium BC or 40th century BC - other millennia)


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Inventions, Discoveries, Introductions



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Urethra

... sphincter is the skeletal muscle that allows voluntary control over urination. In the human female, the urethra is about 1-1.5 inches (25-38 mm) long and opens in the ...

 
 
 
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