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Hill system

A way of writing chemical formulas such that the number of carbon atoms in the molecule is indicated first, the number of hydrogen atoms next, and then the number of all other elements subsequently, in alphabetical order.



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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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