To find out whether each change in population caused the other population to
change, what could the scientist do?
A. Investigate the populations of two other species of plants and
insects to see if they show a similar correlation.
B. Repeat the observations to see if the new data show the same
correlation.
C. Have several other scientists examine the data to see if they see
the same correlation.
D. Investigate populations of the honeybee and plant species that live
in areas where the other species is not present.