Answer:
The part that does NOT change during an experiment.
Explanation:
Because that's what a constant is. I think this is what you meant by this question.
In the absence of autoclave, one can use pressure cooker to sterilize the nutrient agar. The most important thing is that the temperature must be high enough to kill off any microbe present. The pressure cooker can be used in place of autoclave at the temperature of 121 degree Celsius for fifteen minutes.
Answer:
you inhale oxygen and exhale carbon dioxide.
hope this helps and please mark brainliest :)