Complex sentence: Air bubbles up to keep the organisms suspended and to supply oxygen to the areobic bacteria so they can metabolize the food, convert it to energy, CO 2, and water, and reproduce more microorganisms.
Split into simpler sentences: Air bubbles up to keep the organisms suspended and to supply oxygen to the areobic bacteria so they can metabolize. If you havent finished your essay yet,... sorry the food, convert it to energy, CO 2, and water, and reproduce more microorganisms.