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Discussion

Deforestation results from removal of trees without sufficient reforestation; however, even with reforestation, significant biodiversity loss may occur. There are many causes, ranging from slow forest degradation to sudden and catastrophic wildfires. 

The passage best supports the statement that: 

 

  • A.A modeling study shows that reforesting the Lower Mississippi Alluvial Valley can significantly reduce runoff from agricultural lands.
  • B.A new study warns that the world’s largest tropical desert, the Sahara, has suffered a catastrophic collapse of its wildlife.
  • C.It's not just the total number of species preserved that matters; it's the number of key species.
  • D.In developing countries, massive deforestation is ongoing and is shaping climate and geography.

Answer: D

Correct answer: In developing countries, massive deforestation is ongoing and is shaping climate and geography.

The passage is about deforestation as a continuing process with many causes, from slow degradation to catastrophic wildfire, and about the biodiversity lost even where replanting occurs. This option is the only one that stays on that subject. The others narrow to a single modelling study, to the Sahara, or to a point about key species that the passage does not make.

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