Answer:
don't know what class are you you are using which mobile or laptop
<span>So we want to know what statement is an accurate description of vibrations. So humans can hear sound frequencies from 20-20000 Hz. Below 20 Hz is infra sound and above 20000 Hz is ultra sound. Humans cant hear both infra sound and ultra sound so the correct answer is A.</span>
Answer:
<h2>A. a spring & B. a well dried into an aquifer.</h2>
