Which of the following equations is the chemical reaction for cellular respiration?1. 6CO2 + 6H2O → C6H12O6 +6O22. CaSiO3 +CO2 → CaCO3 +SiO23. C6H12O6 + 6O2 → 6CO2 + 6H2O4. C6H12O6 + 6CO2 → 6O2 + 6H2O