Option a.) increasing wolf population is the correct answer because, with more than 50 years spent studying Isle Royale wolves and if the moose population is very large.
The study is the world's longest-running study of predator-prey systems. A parvovirus in dogs accidentally introduced by humans caused the wolf population to collapse in 1980. In 1996, the harshest winter on record and an unexpected moose tick outbreak decimated the moose population. Extreme levels of inbreeding among wolves declined when wolves migrated from Canada in the late 1990s. Correspondingly, wolf populations increased in the early 21st century, despite a general decline in elk.
The most important events of the chronology were largely unpredictable.
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