ExplanationA) The passage explains in a clear sequence what is the main idea: geese can pasture in marshes. According to a new view, there is a less regrowth due to a much more concentration of salt. The standard view of this process is challenged by this new insight into the dynamics of salt-marsh ecosystems. As such, the bold part plays this role. C is the best
B) This question is a bit tricky: it is about inference. Notice that NEVER an inference question repeats or has the same word of the passage. For this reason, E is the most tempting answer but actually is wron. C is the best and it is cited into the text
Quote:
geese do not play a large role in controlling the productivity of marsh systems
I.E geese plays a minor role. C wins
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