Ecologist: The Scottish Highlands were once the site of extensive forests, but these forests have mostly disappeared and been replaced by peat bogs. The common view is that
the Highlands’ deforestation was caused by human activity, especially agriculture. However, agriculture began in the Highlands less than 2,000 years ago. Peat bogs, which consist of compressed decayed vegetable matter, build up by only about one foot per 1,000 years and,
throughout the Highlands, remains of trees in peat bogs are almost all at depths greater than four feet. Since climate changes that occurred between 7,000 and 4,000 years ago favored the development of peat bogs rather than the survival of forests, the deforestation was more likely the result of natural processes than of human activity.
In the ecologist’s argument, the two portions in boldface play which of the following roles?
A. The first is a position that the ecologist rejects; the second is evidence offered in support of that rejection.
B. The first is a position that the ecologist rejects; the second is evidence that has been used to support the position the ecologist rejects.
C. The first is a position that the ecologist seeks to defend; the second is evidence that has been used against that position.
D. The first is a position that the ecologist seeks to defend; the second provides evidence in support of that position.
E. The first is an explanation, rejected by the ecologist, that has been offered for a certain finding; the second is that finding.
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