GRE Verbal Reasoning Question Solved – Sentence Equivalence

All three choices are correct. Martin’s hypothesis was that adding iron to iron-poor regions of the ocean could help alleviate global warming.
Choice A is correct: the passage presents Martin as using the standard understanding of how phytoplankton photosynthesizes as a basis for the hypothesis.
Choice B is correct: the passage states that experiments confirmed that adding iron to iron-poor regions increases phytoplankton growth in those regions. Therefore, Martin’s prediction about this was correct.
Choice C is correct: it can be inferred that in Martin’s hypothesis the means by which adding iron in certain regions could alleviate global warming is that phytoplankton increase in those regions and absorb atmospheric carbon dioxide. The passage states that predators who consume phytoplankton respire carbon dioxide so that the carbon dioxide absorbed by phytoplankton reenters the atmosphere. Therefore, Martin’s prediction about this was incorrect.




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