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Molecules and elements are not the same thing. There are many molecules in elements but not elements inside of molecules.
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There are many different molecules. You should specify a specific molecule
They are many as the oxides of many elements.
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The formula unit contain one molecule.
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Only Two
Carbon, Hydrogen, Oxygen, and Nitrogen are the four base elements of life.
I am not clear about the answer required here. Elements form molecules. Many compounds form polymers, either naturally or synthetically.
All organic molecules are comprised of covalent bonds between hydrogen atoms and carbon atoms. There are many other elements that play a role in modifying the structure of organic molecules, such as oxygen, phosphorous, and nitrogen.