Question

every organism must do what to stay alive?
breathe oxygen
get and use energy
eat plants
eat meat

Explanation:

All organisms need energy for life - sustaining processes like growth, repair, and movement. They obtain and use energy through various means (e.g., photosynthesis in plants, consuming food in animals). Some organisms don't breathe oxygen (e.g., anaerobic bacteria). Not all eat plants (carnivores) or meat (herbivores).

Answer:

get and use energy