a sink of something starling that something & cellular pie is a sink of matter for room inactivity ->  cellular respiration produces energy for cell activites  cellular respiration produces energy for cell activites & cellular actions is when fight neutron matter from poison to wreck matter ->  cellular repiration produces energy by extracting energy from food  cellular repiration produces energy by extracting energy from food & all thunder perform cellular stays -> all cells produce energy by extracting energy from food