2 ms·
It's not an increase in CO2 concentration. It's a decrease in O2 concentration. Humans can't actually sense low O2 levels, but instead only high CO2 levels.
by Doxin 9y ago
It's not an increase in CO2 concentration. It's a decrease in O2 concentration. Humans can't actually sense low O2 levels, but instead only high CO2 levels.