Was anaerobic fermentation occurring? how do you know (use scientific reasoning?

Anaerobic fermentation was occurring because CO2 gas was being made and the test bubbles in the test tubes were getting larger. Anaerobic fermentation is accompanied with foul odour. The gases released are CO2, CH4 and NH3 mainly. Composting without oxygen results in fermentation. I hope this is the answer that you were looking for. 

It is used to during sexual reproduction between humans

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