A(n) is a chemical substance used to treat, prevent, or diagnose a disease or alter one or more functions of the body.

A(n) DRUG is a chemical substance used to treat, prevent, or diagnose a disease or alter one or more functions of the body.

Example: Tylenol (Acetaminophen), Is a Drug that is used to relieve pain, head aches, and reduce fever.

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a boiling water reactor does not boil the water. a pressurized water reactor boils the water faster. a pressurized water reactor is heated directly by the core. a pressurized water reactor does not use fission.