It is a stimulus because parts of the ear respond to exact stimuli which would make this a stimulus. Our bodies make us able to hear normally but some people's bodies are not able to respond to the stimuli which unfortunately explains deaf people.
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What? I don’t understand could you rephrase it
A medicine containing codeine would be used to stop a cough.
This drug is often found in cough medicine, and it is used in order to treat pain, and heal sore parts of your body, especially your inner throat. Although it can have some side effects, it is generally safe to use for anyone above the age of twelve, at least in Europe.