" You have a compound subject. 01i 00It's determination 01b 01u 00and02u 02b 00 work that make the difference. 02i 02br 02br 00Now if you were to ask me why "it" is singular, I'd have to pass.
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01cite10nocy12cite10 You mean " it is ~ that ~ " structure, which is like "it is she that wants to go to the university," right?12blockquote10Right, except it was an obvious plural - 01i00 It's the impurities in our air02i00 01i00and water that are doing this.02i00 The ques