Answer:
Nitrogen is present in the atmosphere in a molecule form about 78 percent. This nitrogen comes to the earth with the water through rainfall. Some nitrogen fix by beneficial microorganisms such as Cyanobacteria and Azotobactor which are present in the roots of higher plants. These microorganisms convert nitrogen molecule into nitrates and used by the plants. There are some other microorganisms which again convert nitrate into nitrogen molecules, called denitrifying bacteria and nitrogen molecule goes to the atmosphere again and complete the cycle.
An atom consists of an atomic nucleus composed of positively charged protons and neutral or uncharged neutrons.
The process of cellular respiration for a particular cell, depending on its efficiency can produce up to B. 38 ATP molecules, most of which come from chemiosmosis and the electron transport chain.
They originate near the Equator!
