The primary purpose of the passage is to
Rationale
According to the passage, which of the following most directly causes leaves to change their color in the fall?
Rationale
In the first two sentences , scientists are presented as all of the following EXCEPT
Rationale
What assumption does the author of the passage make?
Rationale
Which of the following, if true, would most challenge the 'implication' mentioned in the fourth sentence?
Rationale
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