The 02 (O2)

O₂, or molecular oxygen, is a colorless, odorless gas that makes up about 21% of the Earth's atmosphere. It is essential for life, as most organisms, including humans, need oxygen to breathe and produce energy. Plants generate oxygen through photosynthesis, absorbing carbon dioxide and sunlight. Oxygen supports combustion, allowing fires to burn. In medicine, it is used in therapies for respiratory issues. As a part of our environment, it plays a crucial role in various ecological processes and is vital for maintaining life on Earth.