पृथ्वी के वायुमंडल में आयतन के अनुसार ऑक्सीजन का अनुमानित प्रतिशत कितना है?

Which gas accounts for the largest proportion (approximately 78%) of the Earth's atmosphere?

Consider the following statements and choose the correct option: Statement A: Green plants use carbon dioxide (CO2) to make their food. Statement B: An increase in the concentration of carbon dioxide (CO2) in the atmosphere directly leads to a proportional increase in forest cover on Earth.