Answer:
Eating each other
Explanation:
When one organism(Billy) eats another organism(Bobby), the energy is transferred into that organism.
E.
Bobby dies
Billy eats Bobby
Bobby's energy goes to Billy
Billy now has more energy
Hope this helps!
Well, the body has a endless supply of energy (even if you have an energy drink or a lot of coffee) but anyway we will always have a lot of energy until you have to go to the other world (if you know what I mean)
B. all eukaryotic cells
hoped this helped!