Final answer:
Tranquilizers, muscle relaxers, and carbon monoxide are examples of chemicals, with tranquilizers and muscle relaxers also being medications and carbon monoxide being a toxin (2).
Step-by-step explanation:
Tranquilizers, muscle relaxers, and carbon monoxide are all examples of chemicals. Tranquilizers are psychoactive drugs, such as diazepam and chlordiazepoxide, which exert a calming effect and can induce drowsiness. Similarly, muscle relaxers are medications that relieve muscle spasms and might work by causing sedation or by blocking nerve transmission to muscles.
Carbon monoxide, on the other hand, is a toxic gas produced by the incomplete combustion of carbon-containing fuels. While tranquilizers and muscle relaxers can be used safely under medical supervision as medications, carbon monoxide is considered a toxin because it interferes with the delivery of oxygen to bodily tissues. As a result, these substances can be categorized primarily as chemicals due to their different natures and effects on the body.