"Oxygen : Respiration" follows the same relation as:
Show answer & explanation
Correct answer: B
Explanation
The answer is Fuel : Combustion.
The given basic pair "Oxygen : Respiration" is related to an essential chemical and biological process:
Oxygen is the essential element without which the biological combustion process of respiration is impossible. Respiration is actually a slow combustion occurring at the cellular level, where glucose is broken down in the presence of oxygen and energy is released.
Similarly:
Fuel is the essential element without which the chemical process of combustion is impossible. The presence of fuel is the primary condition for combustion.