Plants and trees
a. Nitrogen is the most abundant element in air, making up about 78% of the atmosphere.
Oxygen is a component of air, which is a mixture of gases. Air typically contains around 21% oxygen, along with nitrogen, carbon dioxide, and other trace gases. Oxygen is essential for most living organisms to survive, and it is extracted from the air during the process of respiration.
Oxygen is the most abundant element in Earth's crust.
Oxygen is the second most abundant gas in Earth's atmosphere, making up about 21% of the air we breathe.
Oxygen is the 2nd most common gas in air.Air composition (in % by volume and by moles):79% Nitrogen20% Oxygen1% other gases (argon, carbon dioxide, water vapor etc.)
photosynthesis
They come from plants. It is a cycle. (Carbon Dioxide and Oxygen Cycle) When you breathe out you realse Carbon Dioxide and the plants sucks it in and relase oxygen and that is what we breathe in.
No. Earth's atmosphere most likely originate from volcanic atmosphere. The oxygen is produced by plants.
air water trees
The air
The oxygen atoms in water (H₂O) come from the air we breathe. When we inhale, our lungs absorb oxygen from the air. This oxygen is then used in the process of cellular respiration to produce energy for our body's cells.
The oxygen atoms in CO2 come from the process of photosynthesis in plants. During photosynthesis, plants take in carbon dioxide from the air and water from the soil, and using sunlight as energy, convert them into glucose (sugar) and oxygen.
oxygen
from the air around the airship.
Oxygen is most commonly found in the air of Earths atmosphere.
oxygen can be formed by the electrolysis of water, or by chemical reactions Oxygen is present in air, about 19% by volume, but it is not formed there. Most oxygen is naturally formed in green plants and algea by photosynthesis.
oxygen