each of two or more words having the same pronunciation but different meanings, origins, or spelling.
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The author of Source 3 counters the argument regarding giant pandas by stating that they're beneficial to the ecosystem.
<h3>What is an argument?</h3>
It should be noted that an argument simply means the stance of an individual regarding an issue.
In this case, the author of Source 3 most clearly counter the argument in Source 1 that protecting giant pandas isn't appropriate by stating that they play an important role in the ecosystem.
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It is closest to 1/2 because 1/2 of 16/16 is 8/16