C. A prolonged drought killed much of the grass.
The decrease in the mouse population at 1.5 years is likely due to the prolonged drought, which would have reduced the availability of food and shelter for the mice, leading to a decrease in their population.
The graph below shows the number of wild mice living in a grassland ecosystem over a period of three years.
population graph
What is the most likely explanation for the change in population that occurred at 1.5 years?
A.
A severe hurricane passed through the area.
B.
Food sources suddenly became more scarce.
C.
A prolonged drought killed much of the grass.
D.
A new predator species moved into the area.
1 answer