Temperature, blood sugar level, potassium and sodium, arousal level, body water volume, blood oxygen level are all biological states in the body that must be maintained. This process of maintaining a steady state of balance is known as

In plants and algae, which developed much later, photosynthesis occurs in a specialized intracellular organelle—the chloroplast. Chloroplasts perform photosynthesis during the daylight hours. The immediate products of photosynthesis, NADPH and ATP, are used by the photosynthetic cells to produce many organic molecules.