Respiration, in and of itself, is a key characteristic of living things. However, breathing as humans do, with lungs, is not how all living things respire.
Actually, respiration (breathing is a form of respiration) is a characteristic of life.
an excretion is an example of breathing out Co2
no
breathing and eating
Movement
cell
Carbon dioxide is NOT a life characteristic.
Adaptation
Agonal breathing will not support life; rescue breathing (or CPR if no pulse) is required.
From what I can tell, the most prominent characteristic of life is its changeability and unpredictability. These factors affect just about everyone's life, no matter when or where they live or lived.
One single characteristic, if you have to pick one, is that it multiplies, or reproduces.
Breathing.
an excretion is an example of breathing out Co2
Primarily so that there can be more Life.
no
React to stimulus
Decay
Since agonal breathing will not support life, when agonal breathing occurs it is the same as no breathing; so immediately proceed with care.