Question

5.1.2 exam: semester 1 computer - scored exam
these pictures compare the numbers of prairie dogs in an area at two different times. the picture on the right shows the area 10 years after the picture on the left.
which statement best explains the change over the 10 - year period?
a. the emigration rate remained steady, and the birthrate increased.
b. the death rate decreased, and the immigration rate remained steady.
c. both the birthrate and the immigration rate decreased.
d. both the immigration rate and the birthrate increased.

Explanation:

The number of prairie dogs decreased over 10 - year period. A decrease in population can be caused by lower birthrates and lower immigration rates. Options A, B and D suggest increases in factors that would grow the population. Only option C indicates factors that would lead to a population decline.

Answer:

C. Both the birthrate and the immigration rate decreased