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Year
In 2008, Yellowstone National Park was colder than average for most of the year, including ah
very cold January and December. The following year, 2009, the park had a very cold fall and
an exceptionally cold December.
Complete the paragraph using information from the graph.
During 2008, when temperatures were colder than average, the wolf population size
square During 2009, when the fall and winter were exceptionally cold, the wolf
population size square Extreme temperature was square limiting factor
for the wolf population.