What is the approximate percentage of oxygen in the composition of air?, 78%, 21%, 0.03%, 0.97%, Cars stopped working because oxygen disappeared. Which three conditions are required for combustion to occur (the fire triangle)?, Carbon dioxide, Water, Heat, Oxygen, Fuel, Heat, Nitrogen, Fuel, Light, Oxygen, Carbon dioxide, Fuel, Oxygen is crucial for living things to carry out respiration. Which human activity directly interferes with the oxygen and carbon cycles by reducing oxygen production?, Using public transport, Planting more trees, Recycling plastic bottles, Excessive logging and deforestation
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