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Option 3 : Oxygen
Oxygen is released during the process of photosynthesis. Photosynthesis is the process by which green plants produce glucose.
- It involves the conversion of carbon dioxide gas, water, and minerals the plants take in from their surroundings into sugar and gaseous oxygen.
Oxygen is the chemical element with the symbol O and atomic number 8.
- It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds.
Nitrogen is the chemical element with the symbol N and atomic number 7.
- It is a common element in the universe, estimated at seventh in total abundance in the Milky Way and the Solar System.
Carbon dioxide (CO2) is an important heat-trapping (greenhouse) gas, which is released through human activities such as deforestation and burning fossil fuels, as well as natural processes such as respiration and volcanic eruptions.
Hydrogen is a colorless, odorless, tasteless, flammable gaseous substance that is the simplest member of the family of chemical elements.
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