Although many would suggest oxygen, and this answer is true for all larger animals, a review of all living organisms suggests some that live in the absence of oxygen:
Stratosphere is the layer of atmosphere which contains the gas noted for having sharp clean smell. The name of the gas is ozone and is present as ozone layer in the atmosphere.
The greenhouse effect is essential for life on Earth, as it helps maintain a stable temperature by trapping heat in the atmosphere. Without it, our planet would be too cold for most forms of life to thrive. However, excessive greenhouse gas emissions from human activities are intensifying this effect, leading to climate change and environmental issues. Thus, while the natural greenhouse effect is beneficial, its enhanced version due to human influence poses significant challenges.
Water vapour.
Helium is a specific gas in it's own right and the first on the periodic table. It can be blended with any other gas and is a small percentage of the gasses in our atmosphere.
Earth's atmosphere is about 0.035% CO2. Since the atmosphere is just a thin layer of gas surrounding the earth, CO2 is a much, much smaller fraction of the earth itself.
Chlorine.
colorless, odorless gas that makes up about 21% of Earth's atmosphere. It is essential for the survival of many organisms, as it is involved in cellular respiration and energy production.
oxygen
Carbon dioxide is a common gas in Earth's atmosphere that is essential for plants. Through the process of photosynthesis, plants use carbon dioxide to produce energy in the form of glucose, releasing oxygen as a byproduct. This exchange of gases is crucial for the survival of both plants and animals on our planet.
Oxygen is the gas in the atmosphere that is essential for human life. Our bodies use oxygen to generate energy through the process of respiration. Without oxygen, humans would not be able to survive.
Plants use carbon dioxide (CO2) in the atmosphere during photosynthesis to form sugars and oxygen. This process is essential for the growth and survival of plants.
Oxygen is the most important atmospheric gas for human survival. It is essential for cellular respiration, providing the energy needed for our bodies to function properly. Without oxygen, we would not be able to survive.
Oxygen is the gas in the atmosphere that is important for respiration. It is needed by cells to generate energy through the process of cellular respiration.
Gas. The vapors freely travel through the air and eventually disappear.
Molecular nitrogen gas, N2, is 78% of Earth's atmosphere and does not affect human respiration in any negative way.Molecular nitrogen gas, N2, is 78% of Earth's atmosphere and does not affect human respiration in any negative way.
Human activities can have significant negative impacts on the atmosphere, such as air pollution and greenhouse gas emissions that contribute to climate change. While humans have the ability to degrade the quality of the atmosphere, it is unlikely that we can completely destroy it. However, it is essential to take action to mitigate harmful effects to ensure a sustainable future.
Carbon dioxide (CO2) is the main gas produced by human activity that is causing the atmosphere to grow warmer.