An Ecologist Is Studying Two Competing Snail Species in a Woodland

An ecologist is studying two competing snail species in a woodland habitat.She hypothesizes that one species, the interactor, is controlling the population size of the other, the target species.She designs an experiment to determine the interaction strength between the two species.What should she manipulate and measure?

A) Remove the interactor species and observe changes in the population of the target species.
B) Remove the target species and observe changes in the population of the interactor species.
C) Remove both interactor and target species and observe changes in the populations of other snails.
D) Add additional interactor individuals and observe changes in the population of the target species.
E) Add additional target individuals and observe changes in the population of the interactor species.