A states in the "snag forest habitat" created by high-severity wildfire, many native species are found. Now, D too talks of native animals which thrive in the years following intense fires. DA is a unit—A follows D, as it begins with "additionally". B explains that scientific studies over the years have established that forest fires are an essential part of Western U.S. forest ecosystems, as they create a biodiverse habitat. C follows B quite well : despite the evidence, the government has called for measures to prevent future fires. BC is a unit. Now, considering DA and BC, we find one idea that is common to both groups—forest fires help in creating a biodiverse habitat. Sentence B links well to the unit DA. Note that even though A seems to introduce a new term (snag forest habitat), it explains what this is right away— a snag forest habitat is composed of dead and dying trees created by high-severity wildfire. BDA makes a cogent paragraph. It is not clear from C what more "active management of forests" entails and none of the other sentences relate to this. C is hence the odd one out. Correct Answer: Choice (C)
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