The invading bullfrogs ARE HARMFUL. This is because, they cause decline in the population of the native species.
Decline in the population of the native species will throw the ecosystem into a condition of imbalance which will eventually affect all the living organisms that are living in that ecosystem.
I'm assuming this is from sugar and you're looking for the production of ethanol:
C6H1206(glucose) into 2 of C2H60 (ethanol) and 2 of CO2 (carbon dioxide).
Depending on what you are fermenting as the carbon source, the reaction looks quite different than that.
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