Organisms that get energy by consuming other organisms?

Well Carnivores is an obvious answer, but have we looked in the mirror lately? If you're a vegetarian then you can ignore me. We eat other organisms by meat like cows, hens, and even pigs! We are definitely apart of that. Mammals basically. Amphibians could eat bugs. Reptiles eat meat.

Mitochondria is the cell organelle that produced the energy that is needed in the body system in form of atp, that is why it is called the power house of the cell. energy is needed by the living organisms to carry out the activities which sustain life.  if the mitochondria is destroyed atp will not be produced. if the mitochondria is destroyed, energy production will stop and the affected living organism will not have the energy to carry out the necessary life processes; this will lead to the death of the organism.