Answer:
Digestion "cleans out" the digestive system keeping it free of dead cells. It is important because it serves as the "fuel" for cellular respiration. The glucose is used to produce the ATP our body needs to perform essential functions. ATP is like the "energy currency"/"money" that the living cells "run on". The digestive tract provides the nutrient molecules, through the process of digestion, while the respiratory tract provides oxygen. As such, the two systems work together to give your cells the ingredients they need to produce energy, which they use to communicate, build cellular products and grow.
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