If your body produces 12 of the amino acid needed to make protein where do you think we get the other 8 from

Although your body can manufacture many of the 20 amino acids necessary to make proteins, it can't make them all. Those your body can't produce, called the essential amino acids, must come from the foods you eat. Most Americans consume more protein than they need, so they usually also get the required amino acids, unless they follow a very restrictive diet.

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.