E) a model that use numerical techniques to solve problems for
which analytic solutions
are impractical or impossible
129. What is the main causes of desertification?
A) extinction of living organisms with depletion of forest areas
B) decrease of water circulation with decrease of forest areas
C) decrease in forest areas, increase in arable land
D)
decrease of forest areas, increase of flowers
E) increase of forest areas, flooding of areas
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