A cell membrane is c.selectively permeable because it regulates what materials enter the cell.
It helps get rid of carbon dioxide.
Took me a while to understand any of this XD
C6H12O6+6O2--->6CO2+6H2O+energy
Oxygen(O2) is used to break down glucose(C6H12O6) into energy so the answer is b
7! anything lower is considered acidic and anything about is considered basic.