Answer:
Ozone (O₃) gas
Explanation:
In the Earth's stratosphere, oxygen gas (O₂) is combined with atomic oxygen (O) to form ozone gas (O₃). This is very important because ozone protects the life on Earth from ultraviolet (UV) radiation from the Sun. UV radiation is high-energy radiation, and it is very dangerous for living organisms. Ozone molecule (O₃) absorbs UV radiation and it breaks down by forming O₂ and atomic oxygen (O) again. In this way, it protects the Earth from nocive radiation.
The body constantly makes new cells for the purposes of growth or the replacement of old, damaged, or recently dead cells.
Watching adding notes, correcting, and overall being a part of the project he/she is working on.
Answer:
It contains 2 or 3 ppm of oxygen concentration.
