The balance of gases in the Earth's atmosphere is crucial for several reasons, including maintaining a stable and habitable environment for all life on Earth. This balance of gases is often referred to as the composition of the atmosphere and is primarily composed of nitrogen, oxygen, carbon dioxide, and trace amounts of other gases. Here's why this balance is important:

Plants and animals contribute to balancing the gases in the air through the processes of photosynthesis and respiration:

• Photosynthesis (Plants and Some Microorganisms): Plants absorb carbon dioxide (CO2) from the atmosphere during photosynthesis, using it to produce glucose and release oxygen (O2) as a byproduct. This process helps remove CO2 from the air and replenish O2 levels.
• Respiration (Plants, Animals, and Microorganisms): Organisms, including plants, animals, and microorganisms, respire by taking in oxygen (O2) and releasing carbon dioxide (CO2) as a byproduct. This process contributes to the cycling of these gases in the atmosphere.

In summary, the balance of gases in the atmosphere is crucial for maintaining a stable and habitable environment on Earth. Plants and animals play vital roles in this balance through photosynthesis and respiration, helping to regulate oxygen and carbon dioxide levels and supporting life as we know it.

Dr Gaurav H Tandon thank you for your contribution to the discussion

Our atmosphere is a mixture of gases in delicate balance with the Earth and the organisms that inhabit it. Gases are maintained at certain percentages (partial pressures) so that the planet will remain hospitable to life. As of 2023, by mole fraction (i.e., by number of molecules), dry air contains 78.08% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1% at sea level, and 0.4% over the entire atmosphere.While oxygen is necessary for most life on Earth, the majority of Earth's atmosphere is not oxygen. Earth's atmosphere is composed of about 78 percent nitrogen, 21 percent oxygen, 0.9 percent argon, and 0.1 percent other gases. The earth's atmosphere protects the inhabitants by absorbing harmful solar rays and maintaining a steady temperature. It wards off many dangers of space thereby making life possible on earth. It is thus an important factor of climatic control and a life-sustaining source on earth. The balance of oxygen and carbon dioxide is maintained in the atmosphere by the oxygen released by plants during photosynthesis and carbon dioxide released by human, animals etc. Without the atmosphere, Earth would be lifeless. Carbon dioxide (CO2) and oxygen (O2) are the most important gases for living organisms. Plants take up carbon dioxide from air and give out oxygen during photosynthesis. Animals take up oxygen and release carbon dioxide during respiration. This maintains a balance between oxygen and carbon dioxide in the atmosphere. In this way, the oxygen and carbon dioxide cycle go on. Since forests contain a large number of plants and trees, they help in maintaining the balance between oxygen and carbon dioxide in the atmosphere. Plants take in CO2 during photosynthesis and give out oxygen into the atmosphere, while animals take in oxygen and breathe out carbon dioxide during respiration. In this way, plants and animals help each other in the exchange of gases in the atmosphere. Plants take carbon dioxide during photosynthesis and release oxygen into the atmosphere. Animals and plants take oxygen and release carbon dioxide during respiration. Thus, both plants and animals help each other in the exchange of gases in the atmosphere.