Fairly sure that would be secondary succession.
Answer:
Oil
Explanation:
Oil is the most common fossil fuel internationally, seeing as it is in the top spot for usefulness.
Scientists have concluded that the average human body contains approx. 37.2 trillion cells. However it depends upon your size compared an average human being. :)<span />
The element has 7 protons and 9 neutrons.
Have a nice day! :)
