The map shows six islands near the coast of California. Each of these islands has a population of island foxes descended from the California grey fox. Each island fox population has developed different characteristics from the fox populations on the other islands. The photograph shows a fox from the population found only on the island of Santa Cruz. (Source: © Christian Loader/Alamy Stock Photo) Which of the following is a term used to describe the fact that this subspecies of island fox is found only on Santa Cruz? (1)

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