Some of the conclusions that can be drawn from this scenario include that ________.

Some of the conclusions that can be drawn from this scenario include that ________.
A) cattle improved the soils, contributing to this ecosystem
B) predators were unimportant components of this ecosystem; their removal caused no subsequent problems
C) prairie dogs were unimportant components of this ecosystem; their removal caused no subsequent problems
D) once humans change one thing in an ecosystem, they may find unexpected results occurring elsewhere in the ecosystem
E) prairie dogs were part of a negative feedback loop once they were removed