Life Supporting Gases
Answer: (3) Troposphere
O2, CO2 and N2 being the life supporting gases are chiefly concentrated in troposphere. It is the lowest layer of the Earth’s atmosphere. It is bonded on the top by a layer of air called the troposphere. It contains 99% of the water vapor in the atmosphere.
It is made up of several different gasses. It consists of 78 percent nitrogen, 21 percent of oxygen and 1 percent carbon dioxide.
It starts at the Earth’s surface and goes up to 7 to 20 km above see level. It is heated from below.
Atmosphere is made up with 4 layer.
There are name of the layers-