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David regularly takes a pain reliever for his back pain. After a few weeks, he notices that he needs to increase the amount of pain-relieving drug that he takes each day in order to achieve the same level of pain relief. The phenomenon that David is experiencing is called:

Respuesta :

Answer:

a fact or situation that is observed to exist or happen, especially one whose cause or explanation is in question.

Explanation:

Worthy examples may be the Aurora Borealis, the prowess of Michael Jordan, or the abilities of any given Marvel character blessed by exposure to radioactive materials.

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