That waste product would be carbon dioxide.
The answer is: "2A" or "IIA" or "2" or "II";
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In which "II" stands for the Roman numeral representing the number: "2 (two)".
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Well, MOST pathogenic bacteria is harmless, but SOME could cause death, like tuberculosis, but just in case you would want to mark the answer as, "True".
I hope I helped! =D