Also, most "life" functions of a human body, like breathing, metabolism, ... are actually performed by symbiotic bacteria on our behalf. Human cells can't actually do it themselves
Breathing? Where are the bacteria in the gas-exchange process? And 'metabolism' is a catch-all term that refers to so many different chemical reactions, plenty of which are conducted within the human cells themselves.
He probably confused cellular respiration with physiological respiration, and thus incorrectly conflated the primary purpose of the mitochondria with the physical act of breathing.
Breathing? Where are the bacteria in the gas-exchange process? And 'metabolism' is a catch-all term that refers to so many different chemical reactions, plenty of which are conducted within the human cells themselves.