They capture energy from sunlight and manufacture their own food
I think the nurse is actively listening to the patient. It is a technique in communication that is often used in training, resolution of conflicts and counseling. It is a technique used by nurses in order to reflect on what a particular patients is saying to help them understood more on what is the patient is going through.
Well for both of them to survive they need oxygen, food, water amino acids, and a way to leave waste, but that depends on the type of cell