sentences: cellular respiration is when cells extract energy from food to produce energy
docs: anaerobic_cellular_respiration is cellular_respiration. anaerobic_cellular_respiration is anaerobic_biochemical_process. cellular_respiration is catabolic_pathway. cellular_respiration is multi_step_redox_reaction. general_photosynthesis is biological_energy_transfer. cellular_respiration is chemical_synthesis. respiration is metabolism. cellular_respiration is cellular_respiration. transpiration is organic_process.