Cell-to-cell communication relies upon which type of protein

The proteins that bind to signaling molecules and initiate a physiological response are also referred to as receptors. 
Cell-to-cell communication relies upon the adhesive molecules integrins. Integrins allow cells to maintain contact with one another. Integrins are mechanical links and relay signals both to and from cells.

Transpiration is the answer

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.