Here's the breakdown of the modes of nutrition for each organism: * **Nitrobacter:** This is a bacterium that obtains energy through chemosynthesis. It oxidizes inorganic substances (like ammonia) to create energy. * **Ascaris:** This is a parasitic roundworm. It obtains nutrients by living within a host and absorbing digested food. * **Homo sapiens:** Humans are holozoic, meaning they ingest complex organic food and break it down through digestion.