Cells use ATP as a source of energy to carry out various functions within the cell. In order for ATP to be useful, a chemical reaction that converts ATP to ADP occurs, releasing energy. Which of the following changes in cellular conditions do you predict would cause a decrease in energy production for the cell? a A lack of water molecules in the cell's mitochondria b A lack of carbon dioxide in the cell's mitochondria c An abundance of mitochondria in the cell d An abundance of ATP molecules in the cell