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

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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.
Only phylum bryozoans were not present during Cambrian period. It is an extensive fossil that did not appear in Cambrian nor pre-cambrian rocks. Bryozoans are found in the early Ordovician period. It could have probably existed during the Cambrian period but were soft-bodied or not preserved.
Viruses are tinier than bacteria. ... All viruses have is a protein coat and a core of genetic material, either RNA or DNA. Unlike bacteria, viruses can't survive without a host. They can only reproduce by attaching themselves to cells.
Answer:
Adaption
Explanation:
The mice that are isolated on a island will adapt into many different kinds of mice and will have there own way of living on the island. And the populations will get bigger and bigger.