Final answer:
Eating food is necessary for our cells to obtain glucose and oxygen, which are essential for their functioning.
Step-by-step explanation:
On the cellular level, it is necessary for us to eat food because our cells need glucose and oxygen. Glucose is a source of energy for our cells, and it is obtained from carbohydrates present in the food we eat. Oxygen is needed for cellular respiration, a process that takes place in the mitochondria of cells and produces energy in the form of ATP. Without food, our cells would not receive the necessary nutrients and energy to carry out their functions.
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