Which of these research topics would be considered an example of community ecology?A. Scientists studying the American bullfrog have reported that the longer a bullfrog remains in the tadpole stage, the greater the chance of its survival once it undergoes metamorphosis.B. A researcher found that the reproductive success of bumblebees decreased when the population density of honeybees increased. The decline in the number of bumblebees appeared to be a result of competition for nectar.C. A graduate student collected information about the age structure of the black bear population in Wisconsin.D. An agricultural ecologist investigated the effect of fertilizers on corn crop yields
