Final answer:
Both dark bears and dark-colored beetles showed a trend towards individuals with darker coloration.
Step-by-step explanation:
In each population, there was a trend towards individuals with darker coloration. This trend is seen in both the dark bears and the dark-colored beetles. In the case of the dark bears, both light and dark bears were able to hide on dark tree trunks, which resulted in a split population with extremes in coloration.
However, in the case of the dark-colored beetles, the light-colored beetles were found more easily by predators, causing a shift towards more dark-colored beetles in the population.