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Molecules - A molecule may be composed of two or more atoms...

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Molecules Most of the compounds of interest to biologists are composed of units  called molecules.  A  molecule  is a precise arrangement of atoms, and a  compound  is  a collection of molecules. 
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Unformatted text preview: A molecule may be composed of two or more atoms of the same element, as in oxygen gas, O 2 , or it may be composed of atoms from different elements....
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