For the oxygen created and for the ridding of CO2 that is "used up" in the process
The answer to this question is Lube.
This process involves cleaning every parts of the frozen yogurt machine (even the smallest one on the inside)
This is really important because a frozen yogurt machine will always leave residual ingredients on its smallest parts and it could go rotten if it left inside
D disease reporting. Reporting diseases is extremely important because it could prevent a wide spread epidemic.