Which gas is essential for aerobic respiration in animals?
Oxygen
Aerobic respiration is the process in which cells break down glucose in the presence of oxygen to release energy stored as ATP, mainly inside the mitochondria.
The overall reaction is C6H12O6 + 6O2 → 6CO2 + 6H2O + energy, showing that oxygen is a required reactant.
Carbon dioxide is a waste product of respiration, not a reactant; hydrogen and nitrogen are not consumed in this pathway by animal cells.
Hence, oxygen is the gas essential for aerobic respiration in animals.
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