Wolves were reintroduced into Yellowstone National Park in 1995. The graph below shows the population size of the wolf and elk populations over time. Based upon the data presented in
the graph, which of the following best identifies the HIGHEST wolf population size?
Northern Range Elk Population
ELK AND WOLVES IN YELLOWSTONE
20,000
200
Elk
18,000
180
Wolves
16,000
160
14,000
140
12.000
120
10,000
100
8,000
80
60
6,000
4,000
40
2.000
20
0
0
1960 1963 1966 1969 1972 1975 1978 1981 1984 1987 1990 1993 1996 1999 2002 2005 2008 2011
Yellowstone Wolf Population
20
120
170
190