Final answer:
A bat would be affected by a 120,000 Hz sound because their audible range extends up to 110,000 Hz, and they use echolocation that involves high-frequency sounds.
Step-by-step explanation:
The animal that would be affected by a 120,000 Hz sound is the bat. This is because bats have an audible range that extends up to 110,000 Hz, which is well within the frequency of the sound in question. This sound falls into the category of ultrasound, which is higher than the typical human hearing range of 20 to 20,000 Hz. Dogs, for example, can hear sounds as high as 45,000 Hz, which is well below 120,000 Hz. Elephants respond to substantially lower frequencies (below 20 Hz), and the average fish, depending on the species, generally has a hearing range that does not extend into such high ultrasound frequencies.
It is worth noting that animals like bats use echolocation to navigate and find prey, which relies on emitting and receiving high-frequency sounds such as those in the ultrasound range. This capability is made possible by their well-developed auditory systems that allow them to hear these very high-frequency sounds.