For court-martials, the statute of limitations is five years, except for any offense where the maximum permissible punishment is death, and for absent without leave (AWOL) or missing movement in time of war. In such cases, there are no statute of limitations.
Unlike today where many mitochondria and a cell coexist, mitochondria and cells were once separate organisms. Mitochondria were free-living bacteria that could produce energy, yet they struggled to protect themselves.
1 bacteria and archaea (single-celled microorganisms previously called archaebacteria) 2  no cell nucleus or any other organelles within their cells.  organisms that can live in extreme habitats http://www.ucmp.berkeley.edu/archaea/archaea.html.