Final answer:
High levels of ADP stimulate ATP production in cellular respiration through the electron transport chain and chemiosmosis.b. Stimulate ATP production
Step-by-step explanation:
The effect of high levels of ADP in cellular respiration is to stimulate ATP production. Greater usage of ATP in a cell results in a buildup of ADP. As the concentration of ADP increases, it triggers the cell to increase the production of ATP through processes including electron transport chain and chemiosmosis.