what do we call it when we are able to repeat a process indefinitely without using up or contaminating the resources?

When we are able to repeat a process indefinitely without using up or contaminating the resources, it is known as Renewable Resources .
Explanation:
Renewable resources are the naturally available resources which will replenish to replace the portion of depleted usage and consumption by natural reproduction.One of type of renewable resource is renewable energy including solar, geothermal and wind energy.
These renewable resources are very important part of Earth's natural environment. Water also form a part of renewable source. Water, if carefully used and controlled it's usage in daily life and also given proper treatment then the water is considered as renewable resource

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.