Process:  - Cells obtain glucose and oxygen - The glucose and oxygen create carbon dioxide - The cells release energy - The cells don't have enough oxygen to repeat this - The cells obtain more oxygen from the air - The cells repeat this process.  Perturbation hypothesis: suppose there is a big fire happens, how will it affect more oxygen will reach the body.  Does the supposed perturbation have an effect (direct or indirect) on the process?
The answer to this question is: