Sugar(glucose) and oxygen.
You forgot to add the answers but a non living factor that could contribute could be something like temperature.
The limbic system is a region in the brain consisting of the thalamus, the hypothalamus, the hippocampus, and the amygdala.
When a person has amygdala damage, it would be expected to disrupt the integration of fear.
So, this kind of person will be efficient under fear situations avoiding emotional burnout.
Careers like bridge climbing or skydiving instructor are good for this kind of person.
Photosynthesis and respiration are reactions that complement each other in the environment.
