Why Was the Field Experiment by Krebs and Colleagues So

Why was the field experiment by Krebs and colleagues so important to our understanding of predator and prey dynamics?

A) Because the researchers were able to manipulate three trophic levels simultaneously in the field and on a large scale
B) Because the researchers were able to manipulate three trophic levels simultaneously without the influence of complicating factors such as weather cycles
C) Because the researchers were able to test for the effects of the three trophic levels one at a time, in three separate experiments
D) Because the researchers were able to manipulate three trophic levels as well as normally complicating factors such as weather and genetics

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