A sentence needs an capital letter, correct grammar and punctuation marks.
Answer:
Yasssss free points thank you!
Explanation:
If the root hydro- means "water", then the word that means "an electrical instrument used to monitor underwater sounds" is called a hydrophone. A hydrophone is a kind of microphone that is specifically used to detect and record sound waves underwater.
The answer is most likely c
The growth of the publishing industry
Increased literacy rates in the middle class
The greater amount of leisure available to people
