Sound waves need a medium (or material) to travel through. These kinds of vibrational waves have another name; Longitudinal waves. In fact, there are two main types of waves; transverse and longitudinal. Longitudinal waves are where the vibration moves parallel to the direction the wave is traveling.
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Hunting IS NOT a form of artificial selection because it is not a form of breeding. Artificial selection refers to the intentional breeding of plants or animals. An example would be a thoroughbred racehorses, because they were selectively bred.
