Explanation:
Deaf people can only not hear. Some deaf people speak very well and clearly other deaf people do not because their hearing loss prevented them from learning diffrent languages. so they learn sign languageWHAT IS SIGN LANGUAGESign language is manual communication commonly used by people who are deaf. so when people learn it it helps them communicate with deaf people.THINGS THAT CAUSES DEAFNESScerumen impaction (impacted ear wax)trauma to the ear or head.loud noise/loud sounds.ototoxic medicines.work related ototoxic chemicals.nutritional deficiencies.viral infections and other ear conditions.delayed onset or progressive genetic hearing loss.