Examine the population changes in the graph below. All three species are types of rodents.
Populations: Prairie Species
800
700
600
A species X
species Y
500
• species 2
400
300
200
100
0
2000 2002 2004 2006 2008 2010
Year
Population
What most likely happened to the prairie ecosystem between 2004 and 2006?
A. A predator of species X was introduced to the prairie.
w
ОВ.
The prairie ecosystem experienced a drought.
C. Competition decreased in the prairie ecosystem
D.
The prairie species increased in number