The organ system that obtains oxygen from the air and disposes of waster carbon dioxide back into the air is the system. What is the blank answer?

Which statement is the best summary of the model? a-a series of aerobic and anaerobic reactions take place in cells b- the sun's energy moves through trophic levels in a food chain c-light energy is converted into stored chemical energy plants.d- food molecules are broken down in the cells if living things.