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An ecologist studying desert plants performed the following experiment. She staked out two identical plots that included a few sagebrush plants and...

An ecologist studying desert plants performed the following experiment. She staked out two identical plots that included a few sagebrush plants and numerous small annual wildflowers. She found the same five wildflower species in similar numbers in both plots. Then she enclosed one of the plots with a fence to keep out kangaroo rats, the most common herbivores in the area. After two years, four species of wildflowers were no longer present in the fenced plot, but one wildflower species had increased dramatically. The control plot had not changed significantly in species composition. Using the concepts discussed in the chapter, what do you think happened? (5 pts).

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