Experts anticipate that global atmospheric concentrations of carbon dioxide (CO2) will have doubled by the end of the twenty-first century. ██ ██ █████ ████ ███ ███ ██████████ ██ ██████ ███████ ██ ████████ █████ ██████ ████ ██ █████ ██████████ ██ ████ ████ ███ ███████ ████████ ███
The hypothesis in P1 suggests that increased vegetation would draw more CO2 from the atmosphere, slowing the rise of CO2 levels. The author counters this in P3, arguing that increased vegetation would actually cause CO2 to increase, since there would be more decomposing peat releasing more CO2 into the atmosphere.
Supported. The hypothesis presented in P1 fails to take into account that, even though increased vegetation could absorb CO2, it couldn’t keep up with decomposition rates. CO2 levels would rise, since there would be more decomposing peat releasing CO2 into the atmosphere.
Unsupported. The author never says that plant growth patterns will “alter the distribution of peat.” Instead, he says that the hypothesis in P1 fails to consider that increased vegetation would lead to more peat decomposing, which would increase CO2 levels.
Anti-supported. The hypothesis presented in P1 doestake this into account. In fact, it’s a key part of the argument. The author also admits that increased vegetation could draw more CO2 from the atmosphere.
Difficulty
80% of people who answer get this correct
This is a moderately difficult question.
It is somewhat easier than other questions in this passage.
CURVE
Score of students with a 50% chance of getting this right
25%138
150
75%162
Analysis
Stated
Critique or debate
Science
Answer Popularity
PopularityAvg. score
a
7%
164
b
80%
167
c
1%
154
d
10%
160
e
2%
158
Question history
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