To investigate how the single-celled alga can undergo both photosynthesis and respiration, Jarrick could ask, "Are the inputs of photosynthesis the same as the outputs of respiration?"
This question directly addresses the relationship between the two processes, as photosynthesis produces glucose and oxygen from carbon dioxide and water, while respiration uses glucose and oxygen to produce carbon dioxide and water, thus highlighting the interconnectedness of these two essential biological processes.