Why not CO2?

Question

If all animals survive by breathing in oxygen than why can't we survive by breathing carbon dioxide which has oxygens?

Answer 1

co2 has oxygen along with carbon,which is harmful

Answer 2

Correcting a symptom of the real problem will only delay the inevitable.

People cannot continue to live as we do -- we must evolve or die.

Answer 3

because its a different chemical composition. why not just breathe water theres oxygen it that too

Answer 4

u must know the reaction in all animal's body so that they can "survive". To produce energy u must combine C6H1206 with O2 and the result is CO2 and H2O.

C6H12O6 + 6O2 ---> 6CO2 + 6H2O

To make O2 from CO2 is still somewhat possible, but where will u put the C later?and it took more reaction to make it happen.So O2 is what we need, not the CO2.