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Which of the following statements best proves that the law of conservation of mass is obeyed during cellular respiration?

The starting total number of carbon atoms in glucose is equal to the ending total number of carbon atoms in water.
The starting total number of carbon atoms in glucose is equal to the ending total number of carbon atoms in carbon dioxide.
The starting total number of oxygen atoms in glucose is equal to the ending total number of oxygen atoms in carbon dioxide.
The starting total number of oxygen atoms in glucose and oxygen gas is equal to the ending total number of oxygen atoms in water.