The most likely outcome for a population of mice that becomes isolated on an island is that different species will form as they evolve to fill these niches.
Evolution is a gradual process characterized by the adaptation of the population to certain environmental conditions.
In this case, evolution will lead to mice filling new ecological niches and this diversification will lead to speciation.
In conclusion, the most likely outcome for a population of mice that becomes isolated on an island is that different species will form as they evolve to fill these niches.
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