Ethane, with the chemical formula c2h6, is an example of

an isotope
a hydrocarbon
a gasoline
a kind of coal

The correct answer is a hydrocarbon.

Hydrocarbons are the class of organic compounds, which are entirely  made up of Hydrogen and Carbon. Ethane is a saturated hydrocarbon.

As the chemical formula of ethane is C2H6. This indicates that it has two carbon and six hydrogen atoms in it.

Thus, ethane ( C2H6) is an example of hydrocarbon.

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genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).