Ahearing aid is an electronic device that sound waves.

a.
converts
b.
minimizes
c.
blocks
d.
amplifies

The correct answer is "D.amplifies". A hearing aid is an electronic and small device used by people with problems in hearing sounds. It captures the sounds and amplifies its vibrations considering the necessity of the user. In general, it has three parts: a microphone, amplifier, and speaker. Also, there is a limitation to this amplification. In some cases, the hearing problem cannot be solved by this equipment.

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i would say b. research typically uses a variety of sources