Answer: not eating enough food, because cells need molecules from both food and air to work
Explanation: the air and food are creating energy for the organism
The most abundant fossil fuel is coal... Coal isn't only our most abundant fossil fuel,it's also the one with perhaps the longest history. The U.S. has more coal reserves than any other country in the world. In fact, one-fourth of the all the known coal in the world is in the U.S.
