Define the term 'structural isomerism'.

In chemistry, a structural isomer (or constitutional isomer in the IUPAC nomenclature) of a compound is another compound whose molecule has the same number of atoms of each element, but with logically distinct bonds between them. The term metamer was formerly used for the same concept.

Explanation:

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> they are both natural and not man made

> they can be tracked and predicted by the right tools

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