The answer is b. 80
if a sound reach 85 dB or stronger, it could permanently damage your hearing. The damage happen to the hari cells inside the cochlea.
The ammount of time we listen to it also affect how much damage it will cause.
Hearing loss affect more than 40 million americans
The answer is...
a. Secondary
The correct answer is the first option, I just took a quiz and got it right.