Respiration.
i) O2, & ii) H2O.
Oxygen
CO combines with O2 to create CO2. 2CO +O2 --> 2CO2
It's the molecule of the atom combines with the O2 in the air
Optimum temperature Water Food O2 Energy (light or food ) Space to live .
Mitochondria= respiration-energy+o2 Chloroplasts=photosynthesis-food - energy
That process is the photosynthesis.Respiration absorbes O2 and release CO2.
S8 + 8 O2 → 8 SO2 burning sulfur in the presence of oxygen
Hemoglobin is the iron containing protein in our red blood cells that combines with and carries oxygen.
When Hydrogen is burned in air it combines with Oxygen to form water. 2H2 + O2 -> 2H2O
S8 + 8 O2 ---> 8 SO2 ^ ^ ^ small numbers
we call it photosynthesis. it will make carbohydrates and o2 gas.