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Explanation:
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An example of <span>nonsubstituted alkane that can exist as one of only two isomers is Butane with molecular formula </span>

<span>.</span>
Isomers are those having the same molecular formula but different chemical structure.
Non-substituted alkane means it is not substituted by any other atom.It has only carbon and hydrogen atoms attached to it.
A specific type of cancer is diagnosed by taking the number of diagnoses of that certain cancer type and dividing it by the total number of cancer diagnoses.
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All the populations living together in the same area are called a community
Explanation:
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32 if im incorrect im sorry